Playing outside in the sun all day, he worked up a thirst.
an idea
Frequency:
40
%
As they brainstormed, they worked up an idea for the new marketing campaign.
Idiomatic Expressions for work up
Phrase: work up the courage
Meaning: to gather or build the courage needed to do something difficult or scary
Usage: It took me a while to work up the courage to ask my boss for a raise.