Simple past tense and past participle of uncock.(verb)
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Use "uncocked" in a sentence
"I thumbed the hammer, squeezed the trigger, and uncocked the weapon with a satisfying clickclack."
"Then he lowered and uncocked the weapon, placing it first on the top of the cupboard and then, having clucked at his lack of care, restoring it to his pocket."
"When Coleman uncocked his head and looked into my eyes straight-on, I quickly said, “Sorry, I lost my train of thought.”"