Definition from macmillandictionary.com
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a baseball cap
an elderly man in a peaked cap
a nurse’s/chauffeur’s/sailor’s cap
a school cap
a swimming/bathing/shower cap
Meg screwed the cap back on the bottle.
Airlines began to impose a $50 cap on commissions for domestic flights.
The government introduced new spending caps for local authorities.
the hills with their snowy caps
He won seventeen caps for England in the 1990s.
Barber is joined in the midfield by the England cap Nick Pickering.