American English

Definition of cap noun from the Oxford Advanced American Dictionary



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  1. 1a type of soft flat hat with a bill (= a hard curved part sticking out in front) a baseball cap
  2. 2(usually in compounds) a soft hat that fits closely and is worn for a particular purpose a shower cap see also mob cap, stocking cap
  3. 3a soft hat with a square flat top worn by some college or university teachers, and students at special ceremonies The photo showed her wearing a graduation cap and gown. compare mortarboard
  4. on pen/bottle
  5. 4a cover or top for a pen, bottle, etc. a lens cap synonyms at
  6. on tooth
  7. 5an artificial covering on a tooth that makes it look more attractive
  8. limit on money
  9. 6an upper limit on an amount of money that can be spent or borrowed by a particular institution or in a particular situation The government has placed a cap on military spending.
  10. in toy guns
  11. 7a small paper container with explosive powder inside it, used especially in toy guns see also caps, ice cap, thinking cap
  12. Thesauruslidtop cork cap plugThese are all words for a cover for a container.lid a cover over a container that can be removed or opened by twisting or lifting it off:a jar with a tight-fitting lidtop a thing that you put over the end of something such as a pen or bottle in order to close itcork a small round object made of cork or plastic that is used for closing bottles, especially wine bottlescap (often in compounds) a top for something such as a bottle, or a protective cover for something such as the lens of a cameraplug a round piece of material that you put into a hole in order to block it; a flat round rubber or plastic thing that you put into the hole of a sink in order to stop the water from flowing out:a drain plugPatterns a tight-fitting lid/top/cap a screw top/cap a pen lid/top to put on/screw on/take off/unscrew the lid/top/cap to pull out the cork/plugIdioms
    a feather in your cap
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    an action that you can be proud of This idiom comes from the Native American custom of giving a feather to someone who had been very brave in battle.
See the Oxford Advanced Learner's Dictionary entry: cap