undo
verbTo make something go back to how it was before.
verbTo open or unfasten something that is tied or buttoned.
verbTo cause someone's ruin or failure.
nounA button or command that makes something go back to how it was before.
Syllables
2 syllables
Letters
Phonics breakdown
Phonics Rule: Prefix UN-
UN- means 'not' or 'the opposite of'. 'Unhappy' means 'not happy'.
The prefix un- is added to the beginning of a word to mean 'not' or to reverse an action. 'Happy' → 'unhappy' (not happy). 'Do' → 'undo' (reverse doing).
Tip
UN makes it undone — unhappy, unfair, unlike!
Examples
Phonics Rule: Letter D
The letter D makes the /d/ sound, like in 'dog', 'day', and 'dig'. The tongue tip touches behind the upper teeth.
D is a voiced alveolar stop. The tongue tip touches the ridge just behind the upper front teeth, then releases with voice. It reliably makes the /d/ sound in almost all positions.
Tip
D is for dog — and dog starts with /d/!
Examples
Phonics Rule: O says /uː/
In a few little words the single O says 'oo', like in 'do', 'who', and 'to'.
Usually O says its short or long sound, but in a small set of common words a lone O makes the 'oo' sound /uː/ instead — do, who, to, two, into, onto, tomb, womb. These words are learned by heart.
Tip
Who will do it? O says oo!
Examples
What is SnapPhonics?
A phonics reference for teachers, parents and learners. Every English word, broken into the sounds that make it — with audio, syllables, and the rule behind each spelling.
Save words to study lists, build flashcard decks, and scan your own worksheets and books.