shift key

a typewriter key that determines whether characters are printed in upper or lower case and controls the printing of numbers and symbols.
Computers. a key that performs the same functions as on a typewriter keyboard and also controls other functions, depending on the program: To print a file, depress the shift key and a function key.

1900–05 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
shift key
a key on a typewriter or computer keyboard used to type capital letters and certain numbers and symbols

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It is browser dependent so if that doesn't work try it with the shift key held
  down instead.
Though the raised keyboard was easy to touch type with, the right shift key is
  annoyingly small.
Holding down the shift key while hitting the tab key will reverse direction of
Holding down the shift key while click-dragging a box zooms the map to that box.
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