Bad taste in their mouth - Idioms by The Free Dictionary
a bad taste in (one's)/the mouth (redirected from bad taste in their 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.
a bad (or bitter or nasty) taste in the (or someone's) mouth a strong feeling of distress or disgust following an experience. informal
References in periodicals archive
Roper says ongoing research into the details of flavor reception should ultimately prove helpful to people who suffer from dysgeusia -- a chronic taste-reception abnormality that can literally leave its sufferers with a bad taste in their mouths