blunder
n//ˈblʌn.də(ɹ)//tabbe, blunder, tavla, drumla
A clumsy or embarrassing mistake.
(chess, transitive) To lose a piece due to having made a bad move [with the piece lost].
(chess, transitive) To overlook the possibility of, or end up in, a specified undesirable situation after making a bad move.
(transitive, obsolete) To do or treat in a blundering manner; to confuse.