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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a bad (or bitter or nasty) taste in the (or someone's) mouth
a strong feeling of distress or disgust following an experience. informalFarlex Partner Idioms Dictionary © Farlex 2017