a bad taste in (one's)/the mouth

a bad taste in (one's)/the mouth

A negative impression (based on something that has already happened). I don't know, man, the fact that he lied to you just leaves a bad taste in my mouth.
See also: bad, mouth, taste
Farlex Dictionary of Idioms.

a bad (or bitter or nasty) taste in the (or someone's) mouth

a strong feeling of distress or disgust following an experience. informal
See also: bad, mouth, taste
Farlex Partner Idioms Dictionary
See also:
  • a bad taste in the mouth
  • in bad taste
  • so bad (that) (one) can taste it
  • so bad one can taste it
  • a bad press
  • bad press
  • in (someone's) bad books
  • in someone's bad books
  • have a bad opinion of (someone or something)
  • have a good, bad, high, low, etc. opinion of somebody/something