tshìng-tôo秤砣

sliding weight of a steelyard

sliding weight of a steelyard; person who cannot swim

English Wiktionary, “秤砣” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E7%A7%A4%E7%A0%A3 · confidence: Medium (Wiktionary, Hokkien)