blunder
🇺🇸
/ˈblʌndər/
🇬🇧
/ˈblʌndə(r)/
a big mistake made without thinking
His blunder cost the team the game.
他的重大失误让球队输掉了比赛。
to make a big mistake without thinking
She blundered by sending the email to the wrong person.
她因未加思索将邮件发错人而犯下大错。