A lid is a top, or a cap — some kind of removable or hinged cover for a container. If you forget to put the lid on your tin of cat food, you may discover that your cat and dog have eaten it all by the end of the day.

The lid on your trash can keeps raccoons out of it, and the lid on your travel mug keeps your tea hot for hours. Another lid is your eyelid, the skin that moves over your eyeball like a lid: "Her heavy lids told me she didn't sleep at all." A lid is also slang for a hat or a helmet, and if someone says, "Put a lid on it," they're telling you (somewhat rudely) to quiet down.

Definitions of lid
  1. noun
    a movable top or cover (hinged or separate) for closing the opening at the top of a box, chest, jar, pan, etc.
    “he raised the piano lid
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    trunk lid
    hinged lid for a trunk
    type of:
    cover, top
    covering for a hole (especially a hole in the top of a container)
  2. noun
    either of two folds of skin that can be moved to cover or open the eye
    “his lids would stay open no longer”
    synonyms: eyelid, palpebra
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    type of:
    protective fold
    a flap of tissue that protects what it covers
  3. noun
    headdress that protects the head from bad weather; has shaped crown and usually a brim
    synonyms: chapeau, hat
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    bearskin, busby, shako
    tall hat; worn by some British soldiers on ceremonial occasions
    Panama, Panama hat, boater, leghorn, sailor, skimmer, straw hat
    a stiff hat made of straw with a flat crown
    bonnet, poke bonnet
    a hat tied under the chin
    bowler, bowler hat, derby, derby hat, plug hat
    a felt hat that is round and hard with a narrow brim
    campaign hat
    a broad-brimmed felt hat with a high crown; formerly worn by the United States Army and Marine personnel
    cavalier hat, slouch hat
    a soft felt hat with a wide flexible brim
    cocked hat
    hat with opposing brims turned up and caught together to form points
    cowboy hat, ten-gallon hat
    a hat with a wide brim and a soft crown; worn by American ranch hands
    a tight-fitting hat with visors front and back; formerly worn by hunters
    beaver, dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper
    a man's hat with a tall crown; usually covered with silk or with beaver fur
    dunce cap, dunce's cap, fool's cap
    a cone-shaped paper hat formerly placed on the head of slow or lazy pupils
    Stetson, fedora, felt hat, homburg, trilby
    a hat made of felt with a creased crown
    fur hat
    a hat made of fur
    millinery, woman's hat
    hats for women; the wares sold by a milliner
    shovel hat
    a stiff broad-brimmed hat with the brim turned up at the sides and projecting in front; worn by some clergymen in Britain
    snap-brim hat
    a hat with a snap brim
    a straw hat with a tall crown and broad brim; worn in American southwest and in Mexico
    waterproof hat with wide slanting brim longer in back than in front
    sun hat, sunhat
    a hat with a broad brim that protects the face from direct exposure to the sun
    a hat (Cockney rhyming slang: `tit for tat' rhymes with `hat')
    a tall white hat with a pouched crown; worn by chefs
    tirolean, tyrolean
    soft green felt hat with a feather or brush cockade
    beaver, castor
    a hat made with the fur of a beaver (or similar material)
    bicorn, bicorne
    a cocked hat with the brim turned up to form two points
    church hat
    a fanciful hat of the kind worn by Black women for Sunday worship
    a woman's close-fitting hat that resembles a helmet
    picture hat
    a woman's dressy hat with a wide brim
    pillbox, toque, turban
    a small round woman's hat
    pith hat, pith helmet, sun helmet, topee, topi
    a lightweight hat worn in tropical countries for protection from the sun
    porkpie, porkpie hat
    man's hat with a low, flat crown and a snap brim
    a large bonnet that shades the face; worn by girls and women
    tricorn, tricorne
    cocked hat with the brim turned up to form three points
    type of:
    headdress, headgear
    clothing for the head
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