Harm is a deliberate injury or damage to someone or something. A playground bully is a mean kid who causes harm to other kids.

Harm is both a noun and a verb — when you inflict harm on your brother, you harm him. Physically hurting someone is only one way to harm them. If a classmate spreads a mean rumor about you, that also harms you. The Old English root word is hearm, which means "hurt" and "pain," but also "evil" and "insult."

Definitions of harm
  1. noun
    any physical damage to the body caused by violence or accident or fracture etc.
    synonyms: hurt, injury, trauma
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    brain damage
    injury to the brain that impairs its functions (especially permanently); can be caused by trauma to the head, infection, hemorrhage, inadequate oxygen, genetic abnormality, etc.
    birth trauma
    physical injury to an infant during the birth process
    blast trauma
    injury caused the explosion of a bomb (especially in enclosed spaces)
    bleeding, haemorrhage, hemorrhage
    the flow of blood from a ruptured blood vessel
    blunt trauma
    injury incurred when the human body hits or is hit by a large outside object (as a car)
    bruise, contusion
    an injury that doesn't break the skin but results in some discoloration
    a lump on the body caused by a blow
    an injury caused by exposure to heat or chemicals or radiation
    a displacement of a part (especially a bone) from its normal position (as in the shoulder or the vertebral column)
    electric shock
    trauma caused by the passage of electric current through the body (as from contact with high voltage lines or being struck by lightning); usually involves burns and abnormal heart rhythm and unconsciousness
    break, fracture
    breaking of hard tissue such as bone
    cryopathy, frostbite
    destruction of tissue by freezing and characterized by tingling, blistering and possibly gangrene
    entry of foreign matter into a blood vessel
    penetrating injury, penetrating trauma
    injury incurred when an object (as a knife or bullet or shrapnel) penetrates into the body
    an injury resulting from getting some body part squeezed
    the state of being torn or burst open
    bite, insect bite, sting
    a painful wound caused by the thrust of an insect's stinger into skin
    injury to a muscle (often caused by overuse); results in swelling and pain
    whiplash, whiplash injury
    an injury to the neck (the cervical vertebrae) resulting from rapid acceleration or deceleration (as in an automobile accident)
    wale, weal, welt, wheal
    a raised mark on the skin (as produced by the blow of a whip); characteristic of many allergic reactions
    lesion, wound
    an injury to living tissue (especially an injury involving a cut or break in the skin)
    pull, twist, wrench
    a sharp strain on muscles or ligaments
    raw wound
    a wound that exposes subcutaneous tissue
    marks resembling the wounds on the crucified body of Christ
    abrasion, excoriation, scrape, scratch
    an abraded area where the skin is torn or worn off
    cut, gash, slash, slice
    a wound made by cutting
    a torn ragged wound
    a wound resulting from biting by an animal or a person
    bee sting
    a sting inflicted by a bee
    flea bite
    sting inflicted by a flea
    mosquito bite
    a sting inflicted by a mosquito
    haemorrhagic stroke, hemorrhagic stroke
    stroke caused by the rupture of a blood vessel in the brain
    the purple or black-and-blue area resulting from a bruise
    a minute red or purple spot on the surface of the skin as the result of tiny hemorrhages of blood vessels in the skin (as in typhoid fever)
    black eye, mouse, shiner
    a swollen bruise caused by a blow to the eye
    electric burn
    a burn caused by heat produced by an electric current
    scorch, singe
    a surface burn
    a burn cause by hot liquid or steam
    first-degree burn
    burn causing redness of the skin surface
    second-degree burn
    burn causing blisters on the skin and superficial destruction of the dermis
    third-degree burn
    burn characterized by destruction of both epidermis and dermis
    comminuted fracture
    fracture in which the bone is splintered or crushed
    complete fracture
    break involving the entire width of the bone
    compound fracture, open fracture
    bone fracture associated with lacerated soft tissue or an open wound
    compression fracture
    fracture in which the bone collapses (especially in short bones such as vertebrae)
    depressed fracture
    fracture of the skull where the bone is pushed in
    displaced fracture
    fracture in which the two ends of the broken bone are separated from one another
    fatigue fracture, stress fracture
    fracture resulting from excessive activity rather than a specific injury
    capillary fracture, hairline fracture
    a fracture without separation of the fragments and the line of the break being very thin
    incomplete fracture
    fracture that does not go across the entire width of the bone
    impacted fracture
    fracture in which one broken end is wedged into the other broken end
    closed fracture, simple fracture
    an uncomplicated fracture in which the broken bones to not pierce the skin
    dislocation of a joint
    separation of an epiphysis from the long bone to which it is normally attached without fracture of the bone
    a forward dislocation of one vertebra over the one beneath it producing pressure on spinal nerves
    hernia, herniation
    rupture in smooth muscle tissue through which a bodily structure protrudes
    herniated disc, ruptured intervertebral disc, slipped disc
    a painful rupture of the fibrocartilage of the disc between spinal vertebrae; occurs most often in the lumbar region
    a painful injury to a joint caused by a sudden wrenching of its ligaments
    immersion foot, trench foot
    resembling frostbite but without freezing; resulting from exposure to cold and wet
    cerebral hemorrhage
    bleeding from a ruptured blood vessel in the brain
    blood extravasation
    the leakage of blood from a vessel into tissues surrounding it; can occur in injuries or burns or allergic reactions
    bleeding into the interior chamber of the eye
    bleeding from the uterus that is not due to menstruation; usually indicative of disease (as cervical cancer)
    epistaxis, nosebleed
    bleeding from the nose
    bleeding of the gums
    type of:
    health problem, ill health, unhealthiness
    a state in which you are unable to function normally and without pain
  2. noun
    the occurrence of a change for the worse
    synonyms: damage, impairment
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    detriment, hurt
    a damage or loss
    deformation, distortion
    a change for the worse
    ladder, ravel, run
    a row of unravelled stitches
    a detriment or sacrifice
    warp, warping
    a moral or mental distortion
    type of:
    alteration, change, modification
    an event that occurs when something passes from one state or phase to another
  3. noun
    the act of damaging something or someone
    synonyms: damage, hurt, scathe
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    damage that results in a reduction of strength or quality
    defacement, disfiguration, disfigurement
    the act of damaging the appearance or surface of something
    wound, wounding
    the act of inflicting a wound
    damage inflicted by fire
    an act that despoils the innocence or beauty of something
    the act of severely damaging or ruining something
    the act of burning with steam or hot water
    type of:
    change of integrity
    the act of changing the unity or wholeness of something
  4. verb
    cause or do harm to
    “These pills won't harm your system”
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    make sick or ill
    choke, gag
    cause to retch or choke
    type of:
    injure, wound
    cause injuries or bodily harm to
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