What does undid mean?
Und id is the simple past tense and past participle of the verb undo. To undid something is to reverse or cancel an action, decision, arrangement, or effect that has already occurred: a programmer may undid a mistaken change, or a government may undid an earlier policy. The word can also mean to annul or negate something, such as a contract, agreement, or restriction. Its past form is irregular: undo becomes undid in the simple past, while the past participle is undone. Although it has a technical tone in computing and can appear in discussions of software, history, law, and politics, undid is equally common in everyday speech. It is especially useful when describing the reversal of a completed action and conveys a sense of restoring an earlier state or removing a previous consequence.
verbThe simple past tense and past participle of undo, meaning to reverse, cancel, or annul an action or its effects.
- To reverse or cancel an action or its effects.
- To annul, negate, or undo a previous decision, arrangement, or commitment.
"The editor undid the changes before the document was published."
"A quick command undid the accidental deletion of the entire paragraph."
"The two countries sought to undo decades of economic restrictions through a new agreement."
The tiny word undid carries an entire irregular verb: its present is undo, and its past participle is undone.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does undid come from?
Undid is an irregular past-tense and past-participle form of undo. The verb undo combines the prefix un-, meaning reversal or deprivation, with do, meaning to perform an action; both elements are Germanic in origin. English developed the familiar conjugation undo, undid, undone, while the meaning expanded from physically reversing an action to cancelling decisions, arrangements, and other consequences.
Related word forms
How undid is actually used
Undid is used in both formal and informal English in British and American usage. It is normally transitive, though it can occur without an object when the understood object is clear from context.
Easily confused with undid
Undid is the finite past-tense form, as in “She undid it,” while undone is the past participle and adjective, as in “She has undone it.”
Undue means excessive or improper, whereas undid is the past form of undo.