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"bend forward," Old English stupian "to bow, bend" (cognate with Middle Dutch stupen "to bow, bend"), from Proto-Germanic *stup-, from PIE *(s)teu- (see steep (adj.)). Figurative sense of "condescend" is from 1570s. Sense of "swoop" is first recorded 1570s in falconry.
"raised open platform at the door of a house," 1755, American and Canadian, from Dutch stoep "flight of steps, doorstep, stoop," from Middle Dutch, from Proto-Germanic *stopo "step" (see step).
(also stoolie) A police informer; stool pigeon: He's nothing but a cop's stool (Underworld 1906+, variant 1924+)verb
: to make me stool on a friend (1911+)
[back formation fr stool pigeon]
Act; bit of behavior; thing to do: vulgar ''stunts'' designed to be easily comprehended and greedily relished (1878+)