Undo (6)
'undo' is the definition.
(I know that undo is a more specific form of the action reverse)
This is all the clue.
(Other definitions for reverse that I've seen before include "Tails (of a coin)" , "Move backwards" , "Do u-turn to reserve" , "Change" , "Go in the opposite direction" .)
'undo' is the definition.
(I know that undo can be written as loosen)
This is all the clue.
(Other definitions for loosen that I've seen before include "Untie, relax" , "Make less tight, slacken" , "Relax the tension" , "Work free" , "relax or tear apart" .)