Meaning of “rap” - Learner’s Dictionary

rap

verb uk us /ræp/ (present participle rapping, past tense and past participle rapped)
HIT [ I, T ]

to hit a hard surface to make a sudden, short noise:

He rapped on the door.
MUSIC [ I ]

to perform rap music

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