clanger
noun /ˈklæŋə(r)/
  /ˈklæŋər/
(British English, informal)- an obvious and embarrassing mistake明显且令人难堪的错误 - Mentioning her ex-husband was a bit of a clanger.提及她的前夫是有点令人难堪的失言。 
- He was always dropping clangers (= making embarrassing mistakes or remarks).他总是出岔子,令人十分尴尬。 
 
- Mentioning her ex-husband was a bit of a clanger.