What is the meaning of Blunder?

A clumsy or embarrassing mistake.

A very bad move, usually caused by some tactical oversight.

Confusion; bewilderment; trouble; disturbance; clamour.

To make a big mistake, especially when it is careless or stupid.

To make a bad move, especially caused by tactical oversight.

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.

To move in an unsteady way.

To enter a place or become involved in a difficult situation by mistake.

To do or treat in a blundering manner; to confuse.

present of blunde

a blunder, serious error or mistake

inflection of blunderen:

1. first-person singular present indicative
2. (in case of inversion) second-person singular present indicative
3. imperative

first-person singular present indicative

(in case of inversion) second-person singular present indicative

imperative

blunder (clumsy mistake)

A blunder; a very bad move, especially caused by some tactical oversight.

Source: wiktionary.org