Englishgag reflex
▸ noun a reflex action in which the muscles of the throat contract, often so as to cause retching, typically triggered by something touching the back of the mouth:
the dentist uses acupuncture not only to ease the gag reflex but to reduce anxiety in patients
there was a fishy smell so strong that it triggered her gag reflex
figurative I find it tough to stifle a gag reflex when I see those government TV commercials.