Definitions

1. verb

to boil or cause to boil with an increasing or rising movement, especially with the application of heat from below, so that the liquid rises and foams

“The chef had to upboil the broth quickly to serve it hot to the customers.”

2. noun

the act of boiling or the state of being in a state of rising and foaming boil

“The upboil of the soup was intense and caused the lid to lift off the pot.”