A mar is a flaw, mark, or blemish, like a deep scratch on a wooden table. As a verb, to mar is to make such an imperfection — like the pen mark that mars your crisp, white shirt.

We often think of things that mar as immediately noticeable, like scratches, scars, and blemishes, but sometimes mar describes other ways of ruining something. For example, an unexpected run-in with a difficult person can mar your relaxing day at the beach, just as an unpleasant memory can mar a peaceful state of mind. The thing to remember is, it only takes one scratch, one mean comment, or one negative experience to mar something that is otherwise fine.

Definitions of mar
  1. verb
    make imperfect
    “nothing marred her beauty”
    synonyms: deflower, impair, spoil, vitiate
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    cloud, corrupt, defile, pollute, sully, taint, tarnish
    place under suspicion or cast doubt upon
    blemish, deface, disfigure
    mar or spoil the appearance of
    mangle, maul
    injure badly by beating
    mark, pit, pock, scar
    mark with a scar
    type of:
    inflict damage upon
  2. verb
    destroy or injure severely
    synonyms: mutilate
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    force out, gouge
    force with the thumb
    type of:
    injure or wound seriously and leave permanent disfiguration or mutilation
  3. noun
    a mark or flaw that spoils the appearance of something (especially on a person's body)
    synonyms: blemish, defect
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    birthmark, nevus
    a blemish on the skin that is formed before birth
    chatter mark
    a mark made by a chattering tool on the surface of a workpiece
    check, chip
    a mark left after a small piece has been chopped or broken off of something
    a blemish resulting from a break without complete separation of the parts
    dent, ding, divot, gouge, nick
    an impression in a surface (as made by a blow)
    a small congenital pigmented spot on the skin
    mark, scar, scrape, scratch
    an indication of damage
    burn, burn mark
    a place or area that has been burned (especially on a person's body)
    blot, daub, slur, smear, smirch, smudge, spot
    a blemish made by dirt
    a skin lesion that is a diagnostic sign of some disease
    verruca, wart
    (pathology) a firm abnormal elevated blemish on the skin; caused by a virus
    milium, whitehead
    a small whitish lump in the skin due to a clogged sebaceous gland
    blackhead, comedo
    a black-tipped plug clogging a pore of the skin
    a fine crack in a glaze or other surface
    a small gouge (as in the cover of a book)
    cigarette burn
    a burn mark left by a smoldering cigarette
    blotch, splodge, splotch
    an irregularly shaped spot
    fingermark, fingerprint
    a smudge made by a (dirty) finger
    a blot made with ink
    nevus flammeus, port-wine stain
    a flat birthmark varying from pink to purple
    hemangioma simplex, strawberry, strawberry mark
    a soft red birthmark
    common wart
    a benign growth (often with a rough surface)
    condyloma acuminatum, genital wart, venereal wart, verruca acuminata
    a small benign wart on or around the genitals and anus
    juvenile wart
    a small benign growth on the faces of hands of children
    plantar wart
    a wart occurring on the sole of the foot
    type of:
    appearance, visual aspect
    outward or visible aspect of a person or thing
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