Old English undon "to unfasten and open" (a window or door), "to unfasten by releasing from a fixed position; to cancel, discharge, abrogate, reverse what has been done, put back in a former condition; bring to ruin, destroy," from un- (2) "opposite of" + do (v.). Related: Undone; undoing.
例文
1. If Michael won,he would undo everything I have fought for.
マイケルが勝ったら、私がこれまで努力してきたすべてが無駄になる。
2.Once the damage is done,even modern surgery can 't undo it entirely.
傷害が発生すると、現代外科手術でも完全には除去できない。
3.A heavy-handed approach from the police could undo that good impression.