Simple past tense and past participle of flinch.(verb)
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Use "flinched" in a sentence
"Gawain flinched, and the woman slapped her leg with a burst of laughter."
"And for all these years, the right wingers acted like he was unflinching: It is very hard to avoid the conclusion that President Bush flinched from a fight on constitutional philosophy."
""What's that?" he started a little, and she saw at once that, although she had used her most delicate weapon, he had flinched from the first touch of the blade."