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fat-finger

[fat-fing-ger]Informal.
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adjective
  1. noting or pertaining to errors made by hitting the wrong key or button on a keyboard, keypad, or number pad: fat-finger dialing errors; a large number of typos evidencing the fat-finger syndrome.
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verb (used with object)
  1. to make an error in or on (something) by hitting the wrong key or button: I must have fat-fingered my username. You can easily fat-finger the tiny keyboard on this device.
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Origin of fat-finger

First recorded in 2000–05; so called from using the thumb to type, or accidentally hitting two keys with one finger
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for fat-finger

fat-finger

verb (intr) informal
  1. to make a mistake by pressing the wrong key on a keyboard or number pad
  2. to make an error that causes further problems
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012