unshift

[ uhn-shift ]
/ ʌnˈʃɪft /

verb (used without object)

to release the shift key, as on a typewriter or the keyboard of a computer terminal.

Origin of unshift

First recorded in 1965–70; un-2 + shift
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019