tèng-ko͘-ki釘孤枝

to fight one-to-one

to fight one-to-one; to fight one-on-one

English Wiktionary, “釘孤枝” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E9%87%98%E5%AD%A4%E6%9E%9D · confidence: Medium (Wiktionary)