Verb
(intransitive, car racing) To leave the pits and go out onto the race track
(intransitive, of a machine) To stop working
(intransitive) To show sweat on one's clothes, especially around the armpits.
It was so hot, I was starting to pit out by mid-morning.
(transitive) To make sweaty (of clothes).
At this rate, he was going to pit out his dress shirt, and he didn't have anything to change into before the meeting.