Is “Undo” a Scrabble word?
Yes
UNDO
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Undo
/ʌnˈduː/
noun
1.An operation that reverses a previous action.
“How many undos does this program support?”
verb
1.To reverse the effects of an action.
“Fortunately, we can undo most of the damage to the system by the war.”
2.To unfasten.
“Could you undo my buckle for me?”
3.To impoverish or ruin, as in reputation; to cause the downfall of.
Synonyms: cancel, reverse, unbuckle, unbutton, untie, unzip