To be out-pushed; to lose because of being overpowered by pushing (literally) or by stronger pressure/arguments (figuratively).
後半で相手チームの力に押し負けてしまい、試合に敗れた。
In the second half we were out-pushed by the other team and lost the match.
会議で彼の強い主張に押し負けて、その案に賛成してしまった。
I was overwhelmed by his strong arguments in the meeting and ended up supporting that proposal.
混雑した改札で人の流れに押し負けて駅の外へ出されてしまった。
I was pushed along by the crowded flow at the ticket gate and ended up outside the station.