The Collaborative International Dictionary of English v.0.48:
broad-shouldered \broad-shouldered\ adj. same as big-shouldered. Syn: big-shouldered, square-shouldered. [WordNet 1.5]WordNet (r) 3.0 (2006):
broad-shouldered adj 1: having broad shoulders; "big-shouldered and heavy-armed" [syn: big-shouldered, broad-shouldered, square- shouldered]