trigger-finger

trigger finger

noun
1.
any finger, usually the forefinger, that presses the trigger of a gun.
2.
either forefinger, depending on which hand is dominant.
3.
Pathology. difficulty in straightening or bending a ring finger, caused by inflammation and thickening of its tendon.

Origin:
1820–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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