When you fill something, you add to it until it's full, or has enough. When your car's almost out of gas, you have to fill the tank at a gas station.

You can fill a bathtub with hot water and bubbles, but there's also a figurative way to fill: "Scary movies fill me with anxiety," or "Traveling fills me with a sense of adventure." When the smell of chopped raw onions fills the air in your kitchen, your eyes might reflexively fill with tears. When fill is a noun, it means "something that fills a space."

Definitions of fill
  1. verb
    make full, also in a metaphorical sense
    fill a container”
    fill the child with pride”
    synonyms: fill up, make full
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    make void or empty of contents
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    clutter, clutter up
    fill a space in a disorderly way
    clog, overload
    fill to excess so that function is impaired
    fill as much as possible
    farce, stuff
    fill with a stuffing while cooking
    fill tightly with a material
    bolster, pad
    add padding to
    fill with inhabitants
    top off
    fill to the point of almost overflowing
    fill to overflow
    fill beyond capacity
    fill with ink
    fill again, refill, replenish
    fill something that had previously been emptied
    fill with priming liquid
    fill plentifully
    bring to a whole, with all the necessary parts or elements
    impregnate, saturate
    infuse or fill completely
    impregnate, infuse, instill, tincture
    fill, as with a certain quality
    charge (a conductor) with electricity
    lube, lubricate
    apply a lubricant to
    fill to an excessive degree
    lade, laden, load, load up
    fill or place a load on
    charge, load
    provide (a device) with something necessary
    deluge, flood, inundate, swamp
    fill quickly beyond capacity; as with a liquid
    fill to capacity
    impregnate with a medicinal substance
    alcoholise, alcoholize
    treat or infuse with alcohol
    stuff with cork
    fill with people
    imbue, soak
    fill, soak, or imbue totally
    treat with ammonia; cause to undergo ammonification
    impregnate with thorium oxide to increase thermionic emission
    treat with grease, fill, and prepare for mounting
    drench, imbrue
    permeate or impregnate
    mark with red ink
    load down, pack
    load with a pack
    bomb up
    load an aircraft with bombs
    overcharge, overload, surcharge
    place too much a load on
    recharge, reload
    load anew
    place a new load on
    load or cover with stacks
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
  2. verb
    become full
    “The pool slowly filled with water”
    “The theater filled up slowly”
    synonyms: fill up
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    discharge, empty
    become empty or void of its content
    fill with tears
    become filled to overflowing
    rack up
    supply a rack with feed for (horses or other animals)
    type of:
    change state, turn
    undergo a transformation or a change of position or action
  3. verb
    occupy the whole of
    “The liquid fills the container”
    synonyms: occupy
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    fill or occupy to the point of overflowing
    take up
    take up time or space
    type of:
    occupy a certain position or area; be somewhere
  4. verb
    plug with a substance
    fill a cavity”
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    close, fill up
    fill or stop up
    close with or as if with a seal
    plug, secure, stop up
    fill or close tightly with or as if with a plug
    coapt, conglutinate
    cause to adhere
    type of:
    bushel, doctor, fix, furbish up, mend, repair, restore, touch on
    restore by replacing a part or putting together what is torn or broken
  5. verb
    fill to satisfaction
    synonyms: replete, sate, satiate
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    cloy, pall
    cause surfeit through excess though initially pleasing
    type of:
    consume, have, ingest, take, take in
    serve oneself to, or consume regularly
  6. verb
    eat until one is sated
    “He filled up on turkey”
    synonyms: fill up
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    type of:
    take in solid food
  7. noun
    any material that fills a space or container
    “there was not enough fill for the trench”
    synonyms: filling
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    any of various materials used by dentists to fill cavities in teeth
    type of:
    material, stuff
    the tangible substance that goes into the makeup of a physical object
  8. noun
    a quantity sufficient to satisfy
    “he ate his fill of potatoes”
    “she had heard her fill of gossip”
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    type of:
    enough, sufficiency
    an adequate quantity; a quantity that is large enough to achieve a purpose
  9. verb
    fill or meet a want or need
    synonyms: fulfil, fulfill, meet, satisfy
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    be satisfactory for; meet the requirements of or serve the purpose of
    appease, quell, stay
    overcome or allay
    feed on, feed upon
    be sustained by
    allay, assuage, quench, slake
    satisfy (thirst)
    type of:
    cater, ply, provide, supply
    give what is desired or needed, especially support, food or sustenance
  10. verb
    appoint someone to (a position or a job)
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    type of:
    employ, engage, hire
    engage or hire for work
  11. verb
    assume, as of positions or roles
    synonyms: occupy, take
    assume, strike, take, take up
    occupy or take on
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    type of:
    do work, work
    be employed
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