flinch (v.) Look up flinch at Dictionary.com
1570s, apparently a nasalized form of obsolete Middle English flecche "to bend, flinch," which probably is from Old French flechir "to bend" (Modern French fléchir), also flechier "to bend, turn aside, flinch," which probably are from Frankish *hlankjan or some other Germanic source (cognates: Middle High German linken, German lenken "to bend, turn, lead"), from PIE root *kleng- "to bend, turn" (see link (n.)). Related: Flinched; flinching. As a noun, from 1817.