In a race, when the front runner exhausted himself and thus suffers from a sudden and rather strong decrease of speed before reaching the finish line (often being overtaken by the runner-up as a result), how do you call that?
Specifically, what verb do you use to describe that?
to slump? to slack off? to fade? to disintegrate? ...
By the way, I'm not looking for "to collapse"; the runner will still cross the finish line... :)