What does 敗北 mean?
敗北 is a Japanese noun meaning “defeat (as a verb it means 'to be defeated')” in English. It is written as 敗北 in kanji, はいぼく in hiragana, and haiboku in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
彼は、自分のお気に入りのコーラス・ガールが、ほかの男と結婚した時、敗北を認めた。
He threw in the towel in defeat when his favorite chorus girl married another man.