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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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The standard bung fits most bungholes, while an optional bung with lock fingers can provide even more stability.
The duke was caught on camera ignoring his wife's effort to lock fingers when they joined Queen Elizabeth II at the Queen's Young Leaders Awards ceremony last week.