Definition

To reverse an action or change, making it as if it never happened.

Example

I need to undo the last change I made to the document.

Tense Forms

Conversation

Did you see that bag over there?

Yeah, it looks like it might undo itself if someone isn't careful.

I hope no one accidentally opens it.

Right? That would be a mess!

Synonyms & Antonyms

Definition

To reverse or erase something that has been done, making it as if it never happened.

Example

I need to undo the last change I made to the document.

Tense Forms

Conversation

I accidentally deleted the file I was working on.

Oh no! Can you undo that action?

I wish it was that easy, but I closed the program.

Root Explanation

Undo → It is formed from "un-" (meaning not or opposite of) and "do" (from Old English "don", meaning to perform or act). The word "undo" means to reverse an action or to negate what has been done.

Memory Tip

Think of 'not' or 'opposite' ('un-') of 'doing' something — that's why undo means to reverse an action.

Visually Confused Words