WordNet sense 1 (any fabric used to make trousers):

trousering

WordNet sense 2 (breathing heavily (as after exertion)):

heaving

WordNet sense 3 (breathing laboriously or convulsively):

blown, short-winded, winded, gasping, pursy, winded

WordNet sense 4 (not breathing or able to breathe except with difficulty):

breathless, dyspneal, dyspneic, dyspnoeal, dyspnoeic