"unstressed syllable at the beginning of a verse," 1833, Latinized from Greek anakrousis "a pushing back," of a ship, "backing water," from anakrouein "to push back, stop short, check," from ana "back" (see ana-) + krouein "to strike," from PIE *kreue- (2) "to push, strike" (source also of Russian krusit, Lithuanian krušu, krušti "to smash, shatter," Old Church Slavonic kruchu "piece, bit of food," Old English hreowian "feel pain or sorrow," Old Norse hryggja "make sad"). Related: Anacrustic.

mid-15c., "deduction from payment," from stop (v.) + -age. From late 15c. as "impediment, hindrance, obstruction;" 1650s as "act of stopping."

mid-15c., "refrain;" 1520s, "to stop, cease from some action or proceeding," from Latin desistere "to stand aside, leave off, cease," from de "off" (see de-) + sistere "stop, come to a stand," from PIE *si-st-, reduplicated form of root *sta- "to stand, make or be firm." Related: Desisted; desisting.

of a dog, "to follow or stop at a person's heels," 1810, from heel (n.1). Also see heeled.

also stop-gap, 1680s, from stop (v.) + gap (n.); the notion probably being of something that plugs a leak, but it may be in part from gap (n.) in a specific military sense "opening or breach in defenses by which attack may be made" (1540s). Also as an adjective from 1680s.

"obstruct, hinder passage from or to," 1590s, from French bloquer "to block, stop up," from Old French bloc "log, block of wood" (see block (n.1)). Compare Dutch blokkeren, German blockieren "to blockade." The sense in cricket is from 1772; in U.S. football, "stop or obstruct another player," from 1889. Related: Blocked; blocking.

"without a stop or pause; unending, endless, enduring forever," 1580s, from cease (n.) + -less. Related: Ceaselessly; ceaselessness.

type of whirlpool bath, 1961, U.S. proprietary name, from Jacuzzi Brothers, then headquartered in California, who earlier made jet pumps for motorboats. The family immigrated from Friuli in northern Italy.

1833, "one who or that which develops," agent noun from develop. Photography use in reference to the chemical bath used to bring out the latent image is attested from 1869; meaning "speculative builder" is by 1938.

"Finnish steam bath," also the house or room where it is taken, 1881, from Finnish sauna. Originally in a Finnish context; by 1959 in reference to installation in homes and gyms outside Finland.