aggressiveness; competitive spirit; fighting spirit
Refers to a strong, assertive, or combative attitude. Often used in phrases like 鼻っ柱が強い (strong-willed, aggressive) or 鼻っ柱をへし折る (to crush someone's spirit).
See also: 鼻柱
彼は鼻っ柱が強いから、簡単には引き下がらない。
He's very aggressive, so he won't back down easily.
新人の鼻っ柱をへし折るような言い方はよくない。
It's not good to say things that crush a newcomer's spirit.