The act of exercising or stretching in preparation for strenuous activity

“If you don't do your warm-ups properly you have a greater chance of injury.”

Any act of preparation for a performance

“Drivers are allowed 5 minutes for warm-up before the race starts.”

A period of time allocated for performing warm-ups.

“Keep a sharp eye on the referee during warm-up to check out his mood.”

Attributive use of the noun

“Bill crashed during the warm-up lap.”