Answer:

undo

Answer	Crossword Clue
UNDO	Disconnect
UNDO	Erase
UNDO	Loosen

UNDO	Reverse
UNDO	Rub out
UNDO	Open
UNDO	Reverse, in a way
UNDO	Take apart
UNDO	Take back
UNDO	PC command
UNDO	C--, in Emacs

UNDO	Ctrl+Z command
UNDO	Command + Z command
UNDO	... Send (itchy trigger finger antidote in Gmail)
UNDO	Computer command
UNDO	Mistake maker's computer command
UNDO	Edit-menu command
UNDO	Open, as a clasp
UNDO	Make in reverse

UNDO	Destroy
UNDO	Negate
UNDO	Menu option after a mistake
UNDO	Bring to ruin
UNDO	Word-processor command
UNDO	Computer function often represented by a counterclockwise arrow
UNDO	Loosen, as a knot
UNDO	Word processing command

UNDO	"Go back," in word processing
UNDO	Edit menu option
UNDO	Nullify
UNDO	Bring to naught
UNDO	Cancel
UNDO	Change-of-heart word processing command
UNDO	Program's "Go back!" command
UNDO	Remove, as a knot

UNDO	Deconstruct
UNDO	Edit menu choice
UNDO	Word processor's "Cancel that last step"
UNDO	Backspace, perhaps
UNDO	Backwards-arrow command