The noun flinch has 1 sense (no senses from tagged texts)
1. wince, flinch -- (a reflex response to sudden pain)
Overview of verb flinch
The verb flinch has 1 sense (first 1 from tagged texts)
1. (3) flinch, squinch, funk, cringe, shrink, wince, recoil, quail -- (draw back, as with fear or pain; "she flinched when they showed the slaughtering of the calf")