easy
Click undo to fix the mistake.
What does Undo mean?
Undo means to reverse or unfasten something.
Dictionary definition
To undo something means to reverse an action, open something fastened, or change it back.
Example sentences
Undo in a sentence
medium
I had to undo the knot before I could open the bag.
hard
The editor used undo after realizing the deleted sentence was important to the paragraph.
Writing practice
Ready to write your own? Study the examples, then practice undo in a sentence with Sentence Builder checklist feedback.
Quick practice
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Practice the meaning of Undo
Answer three quick questions about its meaning and related words.
Question 1 of 3
Practice 1
What does undo mean?
Undo means to reverse an action or open something that was fastened.
Practice 2
Which word is a useful contrast for undo?
Do is a contrast because undo means to reverse what was done.
Practice 3
Which word is the past tense of undo?
Undid is the correct past tense form of undo.
Practice complete
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You completed 3 questions.
Pronunciation coach
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Undo
Voice settings
Sounds like
un · doo · strongest beat: doo
Tap each sound part, then blend the whole word together.
Learn
WordUndo.
Partverb.
MeaningUndo means to reverse or unfasten something.
ExampleExample: Click undo to fix the mistake.
Word breakdown
2 syllables. Say each part, then blend the word.
- Syllables
- un · doo
- Strongest beat
- doo
- Ending
- doo
- Tip
- Put a little extra energy on doo.
Your turn
Say Undo
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Synonyms
Words like Undo
Antonyms
Opposite words
doUse for performing an action.
fastenUse for closing or attaching something.
Synonym practice
Want to practice undo synonyms in context? Try a Synonym Search question like "Please undo the knot in the string," then compare close word choices. Practice undo synonyms.
Word family
Undo word family
Related words
Explore related words
Student support
Understand Undo
Hint for students
Undo means to reverse an action or unfasten something. It is common in technology, writing, clothing, and everyday tasks.
Common mix-up
Do not confuse undo with redo. Undo goes back to an earlier state; redo does something again.
Try it in class or at home
Write one sentence that shows undo without using the word undo. Then underline the clue words that show reversing, opening, or going back. Example: After deleting the title by accident, Leo clicked a button to bring it back. Clue words: deleting, by accident, clicked a button, bring it back Now try your own sentence. Ask: Does my sentence show an action being reversed or unfastened?
Teacher prompt
Ask students to explain this model sentence: "Click undo to fix the mistake." Why does undo fit better than redo?
Learning activities
Practice Undo and explore more word games
Cards labelled “Practice UNDO” keep this word in focus. Explore cards open games with other words.
Practice UNDO
Sentence Builder
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