Meaning of bad taste in one's mouth | Babel Free

Definitions

1. A feeling that something is morally despicable as to cause nausea.
   idiomatic
2. A feeling of guilt, responsibility, or embarrassment as to cause nausea.
   idiomatic
3. A feeling of disappointment and frustration.
   idiomatic

Examples

“The more I thought of my orders, the more it left a bad taste in my mouth.”

“Knowing that I had inadvertently aided a killer, left me with a bad taste in my mouth.”

CEFR level