frap v.

early 14c., rappe, "a quick, light blow; a resounding stroke," also "a fart" (late 15c.), native or borrowed from a Scandinavian source (compare Danish rap, Swedish rapp "light blow"); either way probably of imitative origin (compare slap, clap).

Slang meaning "a rebuke, the blame, responsibility" is from 1777; specific meaning "criminal indictment" (as in rap sheet, 1960) is from 1903; to beat the rap is from 1927. Meaning "music with improvised words" was in New York City slang by 1979 (see rap (v.2)).

"iced drink," 1922, American English, from French noun use of frappé "made cold by application of ice," past participle of frapper "to chill," literally "to beat," from Old French fraper "to hit, strike" (see frap (v.)). Earlier in English as an adjective, "iced" (1848).