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負ける， 敗ける， 敗北る， まける
1. to lose, to be defeated
2. to succumb, to give in, to surrender, to yield
3. to be inferior to
4. to break out in a rash due to (e.g. lacquer, shaving, etc.)
5. to reduce the price, to give a discount, to throw in (something extra) for free
失败，被击败；屈服，投降，放弃，让步
に
1. at (place, time), in, on, during
2. to (direction, state), toward, into
3. for (purpose)
4. because of (reason), for, with
5. by, from
6. as (i.e. in the role of)
7. per, in, for, a (e.g. "once a month")
8. and, in addition to
9. if, although
tbd