flinch

1. V-I If you flinch, you make a small sudden movement, especially when something surprises you or hurts you. 畏缩[usu neg]

Leo stared back at him without flinching. 利奥毫不畏缩地回瞪着他。

2. V-I If you flinch from something unpleasant, you are unwilling to do it or think about it, or you avoid doing it. 退缩

The world community should not flinch in the face of this challenge. 该国际团体不应该在这一挑战面前退缩。

3. N the act or an instance of drawing back 退缩