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undo Etymology Atlas
To cancel or reverse something that has been done., To open or unfasten something that is tied, buttoned, or zipped. Pro
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Tap any word to open its Atlas. Pinch to zoom, drag to pan.
undo is a Level B1 word — Pro only
Pro unlocks the Etymology Atlas for levels A2–C2 — plus FSRS-5 spaced repetition, mastery tracking, and the activity dashboard.