noun
acid reflux; heartburn; indigestion
Medical term for stomach acid rising into the esophagus, causing heartburn or water brash. Often used in compound expressions like 溜飲が上がる.
食後に溜飲が上がって胸が焼ける感じがする。
After eating, I get acid reflux and a burning sensation in my chest.
noun
Figurative use, almost exclusively in the set phrases 溜飲を下げる (to feel relieved/satisfied after a grievance is resolved) and 溜飲が下がる (to feel gratified, often at someone else's misfortune).
ライバルの失敗に溜飲を下げるのは大人げない。
It's immature to gloat over a rival's failure.
やっと真実が明らかになり、溜飲が下がった。
The truth finally came out, and I felt a sense of relief.
Compound of 溜 (accumulate) and 飲 (drink), referring to accumulated stomach fluid. The figurative sense derives from the idea of 'settling' or 'relieving' that accumulation.