water brash

noun2

1. •
   Excessive salivation coupled with varying degrees of regurgitation into the esophagus, resulting in upper gastrointestinal symptoms such as heartburn (as the regurgitated stomach contents are typically acidic).

   • Hypersalivation with heartburn, commonly referred to as waterbrash, may be a protective response to gastroesophageal reflux. — 1986
2. •
   (Scotland) Heartburn.