Simple past tense and past participle of unscrew.(verb)
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Use "unscrewed" in a sentence
"The half curved hook shown in Fig. 38 is the safest type; better still, a spiral twist to the hook will add to its uses, and by reversing the turning motion it may be "unscrewed" out if it becomes caught."
"She unscrewed the cap from the bottle, emptied the creek water, and began to fill it with grapes."
"He unscrewed the diamond-encrusted replica of the world hanging off one of his chains."