trigger finger

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trig′ger fin`ger

any finger, usu. the forefinger, that presses the trigger of a gun.
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"If somebody now told me that we could snap fingers and take you back in time for two years and really bring you exactly where you were.
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.