leave a bad taste in one's 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 one's mouth

Make a lingering bad impression on one, as in The argument left a bad taste in my mouth, so after that I avoided talking politics. This expression transfers the bad taste left by consuming bitter or otherwise unpleasant food to a distasteful experience. [Mid-1800s]
See also: bad, leave, mouth, taste
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
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  • leave a bad taste in mouth
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  • leave a bad taste in your 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