Simple past tense and past participle of flicker.(verb)
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Use "flickered" in a sentence
"An instant after the firm declaration was issued, an expression flickered across his features that invisibly reached out to her with an irresistible poignancy."
"As he did, the human let out a deep breath and his expression flickered back to life."
"The Major nodded, and an expression flickered across his face that Kincaid couldn’t quite place."