leave a bad taste in your mouth

leave a bad taste in (one's) mouth

To give one 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. The way they conducted the interview left a bad taste in my mouth. I don't think I'd accept the job even if they offered it.
See also: bad, leave, mouth, taste
Farlex Dictionary of Idioms.

leave a bad taste in your mouth

or

leave a bad taste in the mouth

If an experience leaves a bad taste in your mouth or the mouth, you feel that there was something unpleasant about it. Some of the magazine's jokes about women leave a bad taste in the mouth. Note: Adjectives such as nasty, bitter, and sour can be used instead of bad. I'm not staying where I'm not wanted. The whole thing leaves a sour taste in my mouth.
See also: bad, leave, mouth, taste
Collins COBUILD Idioms Dictionary, 3rd ed.

leave a bad/nasty ˈtaste in the/your mouth

(of an experience) make you feel angry, bitter, or disgusted: The idea that the money had been stolen from her sick mother left a nasty taste in the mouth. When you see someone being treated so unkindly, it leaves a bad taste in your mouth.
See also: bad, leave, mouth, nasty, taste
Farlex Partner Idioms Dictionary
See also:
  • leave a bad taste in (one's) mouth
  • leave a bad taste in mouth
  • leave a bad taste in one's mouth
  • leave a bad taste in the mouth
  • leave a bad/nasty taste in the/your mouth
  • leave a nasty taste in (one's) mouth
  • leave a nasty taste in the mouth
  • a bad taste in (one's)/the mouth
  • a bad taste in the mouth
  • make an impression on
References in periodicals archive
It'll only leave a bad taste in your mouth. Most of all, savor the many flavors of life.
DON'T let Christmas leave a bad taste in your mouth.