blunder

noun

1. A clumsy or embarrassing mistake.
2. A very bad move, usually caused by some tactical oversight.
3. (obsolete)Confusion; bewilderment; trouble; disturbance; clamour.

verb

1. (intransitive)To make a big mistake, especially when it is careless or stupid.

   “to blunder in preparing a medical prescription”

2. (intransitive)To make a big mistake, especially when it is careless or stupid.
3. (intransitive, transitive)To make a big mistake, especially when it is careless or stupid.

   “blunder a rook”

4. (intransitive, transitive)To make a big mistake, especially when it is careless or stupid.

   “blunder a draw”

   “blunder a mate in one”

5. (figuratively, intransitive, sometimes)To move in an unsteady way.

   “I was never distinguished for address, and have often even blundered in making my bow.”

   “blunders on, and staggers every pace”

6. (intransitive)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.”

7. (obsolete, transitive)To do or treat in a blundering manner; to confuse.

   “He blunders and confounds all these together.”

   “Were a Diſpute to be manag'd purely for a Trial of Skill; then to ſhuffle and digreſs from the Matter in hand, ſo as by any means whatſoever to blunder an Adverſary, and ſtop the Progreſs of his Argument, were a more pardonable Piece of Folly.”