noun, noun or participle which takes 'suru', intransitive verb
backward flow; backflow; reflux; regurgitation
Describes a fluid, gas, or current moving opposite to its normal or intended direction. Used in medical, engineering, and everyday contexts. As a suru-verb, it is intransitive.
下水が逆流して、地下室が水浸しになった。
The sewage flowed backward and the basement was flooded.
胃酸が食道に逆流すると、胸やけが起こる。
When stomach acid flows back into the esophagus, heartburn occurs.