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 lid
  6. on tooth
  7. 5an artificial covering on a tooth that makes it look more attractive
  8. limit on money
  9. 6 an 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. 7 a 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