Wiktionary
n. 1 a finger used in pulling the trigger of a firearm 2 the forefinger 3 (context medicine English) difficulty encountered in finger flexion or extension caused by the narrowing of the sheath that surrounds that finger's tendon
Wikipedia
Trigger finger, trigger thumb, or trigger digit (also a sub-set of stenosing tenosynovitis) is a common disorder characterized by catching, snapping or locking of the involved finger flexor tendon, associated with dysfunction and pain. A disparity in size between the flexor tendon and the surrounding retinacular pulley system, most commonly at the level of the first annular (A1) pulley, results in difficulty flexing or extending the finger and the “triggering” phenomenon. The label of trigger finger is used because when the finger unlocks, it pops back suddenly, as if releasing a trigger on a gun.
Usage examples of "trigger finger".
No sense in giving anyone with an itchy trigger finger an illuminated target.
As before, Chavez decided to work on his pistol rather than the easier-to-use MP-10, which anyone with two functioning eyes and one working trigger finger could shoot well.
But she hoped that by keeping her eyes closed and letting her thoughts drift to more pleasant times, she might be able to take her mind off her mild but gradually increasing urge to pee and off the pain in her neck and trigger finger.
Even the experimental flexing of my trigger finger sent a shock up my arm as though I'd grabbed a live wire, and I didn't know if I could do much more shooting.
But he scowled a great deal, he had an overactive trigger finger, and he was much feared in and around Machine-Gun City.
The steel plate of the weapon butt was in the soft tissue of my right shoulder and my trigger finger ran over the trigger guard.
Maybe he was right, but I'd saved his ass more than once with my quick trigger finger.
Her right thumb found the safety, her left hand slamming back the toggle in case the gun had been carried chamber empty, the trigger finger on her right hand poised for a fast squeeze as the toggle slammed forward, two rounds—.