gag reflex

コロナ感染の勢いは収まるどころか広がる一方ですね。　コロナ感染を取り上げたReader's Digestの記事 '20 Pains To Never Ignore' からの引用です。
Among the most disturbing symptoms was his lack of taste and smell. "I couldn't differentiate between cake and pizza. The texture was the same, and there was absolutely no taste. I had to force myself to eat because my gag reflex was so strong. I didn't attribute this to COVID-19 originally, but now I see that it's one of the defining symptoms," Stillman says.
いまや世界中に蔓延しているCOVID-19に罹った人の症状の例ですが、"gag reflex" が分かりません。 "reflex" とあるので、体のどこかの反射動作/神経の作用を指すようですが、辞書を見ます。
・Vocabulary.com: normal reflex consisting of retching; may be produced by touching the soft palate in the back of the mouth

・Wiktionary: A reflex contraction of the back of the throat, evoked by touching the soft palate.

・Wikipedia: The pharyngeal reflex, gag reflex, or laryngeal spasm, is a reflex contraction of the back of the throat, evoked by touching the roof of the mouth, the back of the tongue,
舌ブラシなどで舌の奥に触れるとオエッとなるやつですね。