|ən|dü verb
Etymology: Middle English undon, from Old English undōn, from un- (II) + dōn to do — more at do
transitive verb
1.
a. : to open or loose by releasing a lock or other fastening
undid the door
undid the package
b. : to fix (any of various closures) in an open or free position
undid the bolt
undid a button
c.
(1) : to loosen or remove the clothing of : undress
(2) : to unbutton or untie the fastenings of (as a garment) : open
2. : to make of no effect or as if not done : make null : bring to naught : cancel
lead to a hostility to science, to a wish that its work could be undone — D.W.Brogan
undid the spell by an incantation — Ben Riker
3.
a. : to destroy the worldly means or standing of : ruin the reputation or hopes of
held to an intransigence that undid him
technological advances had taken away his market and undone him
b. : to upset the composure of : unman
mention of the boy would still undo her sometimes
c. : to entice or betray into unchastity : seduce
undid a neighbor's young daughter
4. : to unravel the secret of : explain , interpret
intransitive verb
: to come open
the newspaper … undid with the suddenness of a pocket map — Elizabeth Bowen
Synonyms: see destroy