trigger finger

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trig′ger fin`ger


n.
any finger, usu. the forefinger, that presses the trigger of a gun.
[1820–30]
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References in periodicals archive ?
When it rains it sheets across the area drenching everything, when it's cold it's cold enough to snap fingers and when it's hot, as it was yesterday, it's like a green oasis in a punishing sun-baked outback with just a goalpost and corner flag for shade.
Given that they weigh 25lbs, have a three-foot claw span and can snap fingers like Twiglets, meal times could be quite exciting.