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IT has this meaning here:

rap (HIT)
verb -pp-
1 [I or T] to hit or say something suddenly and forcefully:
She rapped (on) the table to get everyone's attention.
The colonel rapped (out) an order to his men.

2 [T] to criticize someone, especially officially:
The headline read 'Judge raps police'.

rap
noun [C]
a sudden short noise, especially one made by hitting a hard surface:
There was a series of raps on the window.

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Other meanings for RAP are:

rap (MUSIC)
noun [U]
a type of popular music with a strong rhythm in which the words are spoken, not sung:
a rap artist/star

rap
verb [I] -pp-
to perform rap

rap (PUNISHMENT)
noun [C or U] MAINLY US SLANG
an accusation of crime, or a punishment:
He always said he was jailed on a bum rap (= false accusation).
The police caught him, but somehow he