The Collaborative International Dictionary of English v.0.48:
knocked-out \knocked-out\ adj. damaged; -- not used of persons; as, the gym has some of the most knocked-out equipment since Vic Tanny. Opposite of undamaged. [prenominal] Syn: knocked out. [WordNet 1.5]WordNet (r) 3.0 (2006):
knocked-out adj 1: damaged; "the gym has some of the most knocked-out equipment since Vic Tanny"