1. made a serious mistake or error in judgment
Usage: past tense of blunder
2. moved clumsily or awkwardly
Usage: past tense of blunder

Examples

• The quarterback blundered when he threw the ball directly to the opposing team.
• She blundered through her presentation without proper preparation.
• The company blundered by releasing the product too early.
• He blundered into the room, knocking over a chair.
• The politician blundered with his controversial statement.
• They blundered around in the dark looking for the light switch.
• The student blundered on the final exam question.