虫むし酸ず

noun

stomach acid that comes up into the mouth; acid reflux fluid

Refers to the sour fluid that rises from the stomach due to acid reflux. Most commonly encountered in the idiomatic expression 虫酸が走る (むしずがはしる), meaning 'to be disgusted' or 'to make one's skin crawl'.

See also: 虫唾が走る

• 虫むし酸ずが走はしるような話はなしだ。

  It's a story that makes my stomach turn.

• 胸むねやけで虫むし酸ずが上あがってきた。

  I had heartburn and stomach acid came up into my mouth.