the-hing䖙胸

backstroke

backstroke (a swimming stroke swum on one's back)

English Wiktionary, “䖙胸” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E4%96%99%E8%83%B8 · confidence: High (Wiktionary, PH/Quanzhou/Jinjiang)