"Leg defeat" refers to a situation where someone loses in a competition or fight, specifically when it involves their legs being weakened or taken out from under them physically or figuratively. Full definition
Arsenal chasing the impossible on the return leg after suicidal first leg defeat. (justarsenal.com)
Eight Leicester City fans were found guilty of public order offences following disturbances before last season's Champions League quarterfinal first leg defeat at Atletico's former Vicente Calderon home. (espn.com)
Bayern Munich restored some pride in the second leg with a 3 - 2 victory, but ultimately paid the price for the first leg defeat in Barcelona. (dw.com)