鹰角的利刃

Meaning

Means "support unit" in Arknights. Wordplay: "辅助" (support) → "扶住" (hold up) → "拐" (crutch). Having a "crutch" increases ally damage or lowers enemy defense. Allegedly from FGO's Darius, who was weak alone but became top DPS with Zhuge Liang and Tamamo ("Da Ming Fox" team). His spear looked like a crutch, so "crutch" became slang for support units.