Merriam-Webster's Collegiate® Dictionary, 11th Edition
RAP
I. noun
Etymology: Middle English rappe
Date: 14th century
a sharp blow or knock,
2. a sharp rebuke or criticism, a negative and often undeserved reputation or charge,
3. the responsibility for or adverse consequences of an action , a criminal charge, a prison sentence,
II. verb (rapped; rapping)
Date: 14th century
transitive verb to strike with a sharp blow, to utter suddenly and forcibly, to cause to be or come by raps , to criticize sharply, intransitive verb to strike a quick sharp blow, to make a short sharp sound,
III. transitive verb (rapped; also rapt; rapping)
Etymology: back-formation from rapt
Date: 1599
to snatch away or upward, enrapture ,
IV. noun
Etymology: perhaps from 1rap
Date: 1834
a minimum amount or degree (as of care or consideration) ; the least bit ,
V. intransitive verb (rapped; rapping)
Etymology: perhaps from 1rap
Date: 1929
to talk freely and frankly, to perform rap music, V
I. noun
Date: 1967
talk , conversation ,
2. a rhythmic chanting often in unison of usually rhymed couplets to a musical accompaniment, a piece so performed