Negate the effects of (4)

I believe the answer is:
undo
(Other definitions for undo that I've seen before include "Destroy - nullify" , "Dissolve - ruin" , "Cause to become loose" , "Ruin or undermine" , "Remove the wrapping" .)
I believe the answer is:
undo
(Other definitions for undo that I've seen before include "Destroy - nullify" , "Dissolve - ruin" , "Cause to become loose" , "Ruin or undermine" , "Remove the wrapping" .)