Meaning of “rap” - Learner’s Dictionary

rap

noun uk us /ræp/
MUSIC [ U ]

A2 a type of music in which the words are spoken and there is a strong beat:

a rap artist
SOUND [ C ]

a sudden, short sound made when someone or something hits a hard surface:

There was a rap on the window.

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