yeast

C1 · Advanced Countable noun Science Technical

n. a type of very small living thing that is a fungus.

n. any of various small, single-celled fungi that reproduce by budding or fission.

“Scientists study how different types of yeast react to various sugars.”

“The researcher isolated a specific strain of yeast from the skin of the grapes to study its unique fermentation properties.”

C2 · Proficiency Science Technical · Archaic

v. to bubble and change chemically, like when making beer.

v. to undergo or cause fermentation; to become frothy through the action of fungi.

“The mixture began to yeast as the natural sugars broke down.”

“The liquid was left in the vat to yeast for several days until the desired alcohol content was achieved.”

C1 · Advanced Slang · Informal

v. to make a story seem bigger or more important than it really is.

v. to inflate the truth or provide an exaggerated account of an event.

“He is always yeasting about how much money he makes at his new job.”

“Don't listen to his version of the story; he tends to yeast whenever he wants to impress a new audience.”