What is undo in past tense?
past tense of undo is undid.
What undo means?
transitive verb. : to open or loose by releasing a fastening. : to make of no effect or as if not done : make null : reverse.
Is the word undone correct?
undone adjective (NOT FASTENED)
unfastened: Why didn't you tell me my zip was undone!
What is being undone?
: not done : not performed or finished.