blunder UK /ˈblʌn.dəː/US /ˈblʌn.dɚ/verb 7noun 3forms 4phrases 1 verb7 •To make a big mistake, especially when it is careless or stupid. •To make a bad move, especially caused by tactical oversight. •To enter a place or become involved in a difficult situation by mistake.He and I had blundered into the middle of a gang fight once and I saw him shank a guy-stuck homeboy in the chest and strolled off cool as you please. — 2007 •To move in an unsteady way.I was never distinguished for address, and have often even blundered in making my bow. — 1759 •To lose a piece due to having made a bad move [with the piece lost]. •To overlook the possibility of, or end up in, a specified undesirable situation after making a bad move. •(no longer used) To do or treat in a blundering manner; to confuse.He blunders and confounds all these together. — 1676 noun3 •A clumsy or embarrassing mistake.We could laugh at our scholastic blunders and our social faux pas's. — 1869 •A very bad move, usually caused by some tactical oversight. •(no longer used) Confusion; bewilderment; trouble; disturbance; clamour. formsblunder'd · blundered · blundering · blunders Phrases with blunder thud and blunderAn adventure or active endeavor that is characterized by, often humorous, errors.