noun

1. A clumsy or embarrassing mistake.

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

Synonyms: blooper, boo-boo, error, faux pas, flub, fluff, fumble, gaffe

verb

1. To make a clumsy or stupid mistake.

   “to blunder in preparing a medical prescription”

2. To move blindly or clumsily.

3. To cause to make a mistake.