He flinched at the sight of the blood.

他一见到血就往后退。

《牛津词典》

He flinched each time he spoke to her.

他每次和她说话都是畏畏缩缩的。

youdao

He flinched as the cold water struck him.

他被冷水浇得缩了回去。

youdao

He flinched a little when the book hit his chest, then edged his chair back to pick it up off the floor.

NEWYORKER: The Repatriates

But then, perhaps they'll have a point because it was up to Romney to say no to them -- and at the crucial moments, he flinched.

CNN: Romney caves to far right

And he kind of flinched and said, well, I wouldn't characterize it as a last stand.

NPR: McCain Keeps Home Fires Burning