Bringing up his divorce was a terrible mistake; I completely put my foot in my mouth.

"put your foot in your mouth" 是一个英语习语，字面意思是"把脚放进嘴里"，实际意思是"说错话、失言"，通常指无意中说了令人尴尬或不合适的话。习语中的 "your" 是可替换的物主代词，可以根据主语替换为 my、his、her、our、their 等。