Definition
To make an embarrassing mistake in speech or action; to say or do something that causes awkwardness.
出醜（言行上的错误）
At the wedding, he meant to compliment the bride, but he dropped a brick by saying her ex-boyfriend's name.
在婚礼上，他本想称赞新娘，但却说出了她前男友的名字，犯了个大错。
She meant to keep the secret, but she dropped a clanger by accidentally revealing it.
她本想保守秘密，但不小心说漏了嘴，犯了个大错。
He dropped a brick during the important meeting by saying some things he shouldn't have.
他在重要会议上说了一些不该说的话，犯了个大错。