perk (n.)

1869, shortened colloquial form of perquisite (q.v.), also perq. As a verb, 1934 as shortened and altered form of percolate, also perc.

perk (v.)

late 14c., "to make oneself trim or smart," perhaps from Old North French perquer "to perch" (Modern French percher; see perch (n.1)), on notion of a bird preening its plumage. Sense of "raise oneself briskly" is first attested 1520s; perk up "recover liveliness" is from 1650s. Related: Perked; perking.

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