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bridle (v.): "to control, dominate," c. 1200, from Old English bridlian "to fit with a bridle," from bridel (see bridle (n.)). Meaning "to throw up the head" (as a horse does when reined in) is from mid-15c. Related: Bridled; bridling.
debridement (n.): "removal of damaged tissue from a wound," 1839, from French débridement, literally "an unbridling," from dé- (see de-) + bride "bridle," from a Germanic source akin to Middle High German bridel (see bridle). Related: debride, debriding.
idle (v.): late 15c., "make vain or worthless," from idle (adj.). Meaning "spend or waste (time)" is from 1650s. Meaning "cause to be idle" is from 1789. Sense of "running slowly and steadily without transmitting power" (as a motor) first recorded 1916. Related: Idled; idling.
sidle (v.): "to move or go sideways," 1690s, back-formation from obsolete Middle English sidlyng (adv.) "obliquely, sideways; aslant; laterally" (early 14c., perhaps in Old English), from side (n.) + adverbial suffix -ling; altered on analogy of verbs ending in -le. Related: Sidled; sidling. Old English had sidlingweg (n.) "sidelong-way, oblique road."