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rap 1

v. rapped, rap·ping, raps
1. To hit sharply and swiftly; strike: rapped the table with his fist.
2. To utter sharply: rap out a complaint.
3. To criticize or blame.
To strike a quick light blow: rapped on the door.
1. A quick light blow or knock.
2. A knocking or tapping sound.
3. Slang
a. A reprimand.
b. A sentence to serve time in prison.
4. Slang A negative quality or characteristic associated with a person or an object.
beat the rap Slang
To escape punishment or be acquitted of a charge.
take the rap Slang
To accept punishment or take the blame for an offense or error.

[Middle English rappen, possibly of imitative origin.]

rap 2

n. Informal
The least bit: I don't give a rap about office politics. I don't care a rap what you do.

[From obsolete rap, 18th-century Irish counterfeit halfpenny, from Irish Gaelic, alteration (possibly influenced by rap, piece, bit) of ropaire, cutthroat; see rapparee.]

rap 3

1. Slang A talk, conversation, or discussion.
a. A form of popular music developed especially in African-American urban communities and characterized by spoken or chanted rhyming lyrics with a strong rhythmic accompaniment.
b. A composition or performance of such music.
v. rapped, rap·ping, raps
1. Slang To discuss something freely and at length.
2. To perform rap music.
To perform as rap music: lyrics that were rapped; rapped the chorus of the song.

[Possibly from rap.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
King Lud flew into a frightful rage, tossed his crown up to the ceiling, and caught it again--for in those days kings kept their crowns on their heads, and not in the Tower--stamped the ground, rapped his forehead, wondered why his own flesh and blood rebelled against him, and, finally, calling in his guards, ordered the prince away to instant Confinement in a lofty turret; a course of treatment which the kings of old very generally pursued towards their sons, when their matrimonial inclinations did not happen to point to the same quarter as their own.
Nor, because it came up slowly, and because Collins had anticipated the yawn by being one thought ahead of Hannibal in Hannibal's own brain, was the nose rapped.
Even the Cock-lane ghost had been laid only a round dozen of years, after rapping out its messages, as the spirits of this very year last past(supernaturally deficient in originality) rapped out theirs.
Being at last, however, rather disturbed in his pleasant reflection by their repetition, he rapped at one of the doors with his stick, and cried: