What part of speech is “undo”
Verb
Definition:
as a verb, 'undo' can be used to express the action of reversing or canceling a process. This meaning for the word has a slightly stronger connotation than the noun form, since it implies agency on the part of the subject.
Examples:
1. She undid the damage done by the fraud.
2. Undo the last command to prevent a crash.
3. I will have to undo this terrible decision.
Tips:
the word can imply the restoration of a situation as well as the removal or cancellation of something. Pay attention to the context when you correctly use the word.