The sense of rap meaning a blow or strike is probably echoic in origin. Much like tap and clap, it represents the sound of the blow. The earliest citation in both the Oxford English Dictionary and the Middle English Dictionary is from the poem Roland and Vernagu, found in the Auchinleck manuscript (Edinburgh, National Library of Scotland, Advocates MS 19.2.1), which was copied c. 1330. The passage depicts a battle between the knight Roland and the giant Vernagu:

Þai gun anoþer fiȝt,
And stones togider þrewe.
Gode rappes for þe nones,
Þai ȝauen wiþ þe stones,
That sete swithe sore.

(They began another fight, and together threw stones. For the moment, they gave good raps with the stones very violently in that place.)

The verb appears a few decades later.

This basic sense of a blow has spawned three metaphorical senses that are in common use today. (There are lots of different senses, but I’m focusing on these three that are probably of the most interest.) A rap can also be a criminal charge or accusation, a discussion, or a genre of music.

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