Definitions
1.NounA clumsy or embarrassing mistake.
2.NounA very bad move, usually caused by some tactical oversight.
3.NounConfusion; bewilderment; trouble; disturbance; clamour. .mw-parser-output .defdate{font-size:smaller}
4.VerbTo make a big mistake, especially when it is careless or stupid."to blunder in preparing a medical prescription; blunder a rook; blunder a draw; blunder a mate in one"
5.VerbTo make a bad move, especially caused by tactical oversight.
6.VerbTo lose a piece due to having made a bad move .mw-parser-output .object-usage-tag{font-style:italic}.mw-parser-output .deprecated{color:var(--wikt-palette-grey-lime-8,olivedrab)}[with the piece lost]."blunder a rook"
7.VerbTo overlook the possibility of, or end up in, a specified undesirable situation after making a bad move."blunder a draw; blunder a mate in one"
8.VerbTo move in an unsteady way.
9.VerbTo enter a place or become involved in a difficult situation by mistake.
10.VerbTo do or treat in a blundering manner; to confuse.