Simple past tense and past participle of squint.(verb)
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Use "squinted" in a sentence
"He watched with astonishment as the orange juice poured crimson into his glass, then frowned at the label and squinted."
"We sat at the table and drew on tissues with magic markers, and then hung them in the window because they looked just like stained glass if you kind of squinted when you looked at them."
"If I kind of squinted and looked sideways, I could make out the white crow perphed on the battlements, looking down."