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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.]
References in classic literature ?
The word `limes' was like fire to powder, his yellow face flushed, and he rapped on his desk with an energy which made Jenny skip to her seat with unusual rapidity.
I rapped Prince on the nose, while Ordinsky explained that he had not had his dress clothes on for a long time, and tonight, when he was going to play for a concert, his waistcoat had split down the back.
Sam's palm-leaf had been ingeniously disentangled from all pretensions to braid, as respects its brim; and the slivers starting apart, and standing upright, gave it a blazing air of freedom and defiance, quite equal to that of any Fejee chief; while the whole brim of Andy's being departed bodily, he rapped the crown on his head with a dexterous thump, and looked about well pleased, as if to say, "Who says I haven't got a hat?
He tried to steal sugar under his aunt's very nose, and got his knuckles rapped for it.
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.
He told every rivet on my armour with a cloth-yard shaft, that rapped against my ribs with as little compunction as if my bones had been of iron But that I wore a shirt of Spanish mail under my plate-coat, I had been fairly sped.
Then he rapped on the door with a bit of stick like a handspike that he carried, and when my father appeared, called roughly for a glass of rum.