逆ぎゃく流りゅう

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.

• 下げ水すいが逆ぎゃく流りゅうして、地ち下か室しつが水みず浸びたしになった。

  The sewage flowed backward and the basement was flooded.

• 胃い酸さんが食しょく道どうに逆ぎゃく流りゅうすると、胸むねやけが起おこる。

  When stomach acid flows back into the esophagus, heartburn occurs.