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English definition of “cap”

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cap

noun [C] uk   /kæp/ us  

cap noun [C] (HAT)

A2 a soft flat hat that has a curved part sticking out at the front, often worn as part of a uniform a thin hat that stops your hair getting wet when swimming or taking a shower: a shower/swimming cap UK a hat given to someone who plays for their national team in a particular sport, or a player who receives this: Davis has 17 Scottish caps (= has played for Scotland 17 times). The team contains five international caps.
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cap noun [C] (COVER)

a small lid or cover: The camera has a lens cap to protect the lens surface. an artificial covering on a tooth that protects it

cap noun [C] (BIRTH CONTROL)

UK →  diaphragm

cap noun [C] (EXPLOSIVE)

cap noun [C] (LIMIT)

a limit on the amount of money that can be charged or spent in connection with a particular activity: Central government has imposed a cap on local tax increases.

cap

verb uk   /kæp/ (-pp-) us  

cap verb (LIMIT)

C1 [T often passive] to put a limit on the amount of money that can be charged or spent in connection with a particular activity: High spending councils have all been (rate/charge) capped. Our mortgage is capped at 8.75 percent for five years.

cap verb (SPORT)

be capped UK to play for your national team in a particular sport: She's been capped for Scotland nine times.

cap verb (COVER)

[T] to cover the top of something: The mountain was capped with snow. have your teeth capped (= protected with an artificial covering)
(Definition of cap from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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