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payoff (n.)[payoff 词源字典]: also pay-off, 1905, "winnings from gambling," from pay (v.) + off. Meaning "graft, bribes" first attested 1930. Phrase to pay off "be profitable" is first recorded 1937.[payoff etymology, payoff origin, 英语词源]
payola (n.): "graft" (especially to disc jockeys from record companies to play their music), 1938 (in a "Variety" headline), from pay off "bribery" (underworld slang from 1930) + ending from Victrola, etc. (see pianola). Compare also plugola (1959), from plug (n.) in the advertising sense.
shut (v.): Old English scyttan "to put (a bolt) in place so as to fasten a door or gate, bolt, shut to; discharge, pay off," from West Germanic *skutjan (cognates: Old Frisian schetta, Middle Dutch schutten "to shut, shut up, obstruct"), from PIE *skeud- "to shoot, chase, throw" (see shoot (v.)). Related: Shutting.

Meaning "to close by folding or bringing together" is from mid-14c. Meaning "prevent ingress and egress" is from mid-14c. Sense of "to set (someone) free (from)" (c. 1500) is obsolete except in dialectal phrases such as to get shut of. To shut (one's) mouth "desist from speaking" is recorded from mid-14c.