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to lose; to be defeated
to succumb; to give in; to surrender; to yield
to be inferior to
to break out in a rash due to (e.g. lacquer, shaving, etc.)
to reduce the price; to give a discount; to throw in (something extra) for free
油断すると格下の相手にも敗北る。
If you let your guard down, you can lose even to a weaker opponent.
強い相手に敗北ても学ぶことがある。
Even losing to a strong opponent teaches you something.
決勝戦で優勝候補に敗北た。
We lost to the tournament favorite in the final.