Meaning of “cap” - Learner’s Dictionary

cap

verb [ T ] uk us /kæp/ (present participle capping, past tense and past participle capped)
END

to be the last and the best or worst event in a series of events:

The party capped a wonderful week.
LIMIT

to put a limit on an amount of money that can be borrowed, charged, etc:

[ often passive ] The interest rate has been capped at 5%.
COVER

to cover the top of something:

[ often passive ] The mountains were capped with snow.

(Definition of “cap verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)