下棋
xià qí · HSK 7
to play chess
♟️ 下棋 = 下 play/put-down + 棋 board-game = to play chess
棋 covers board games broadly (chess, go, xiangqi); 下 here means to make a move or set down a piece. The verb 下 pairs with board games the way English says play a game.
下 — horizontal line 一 + mark below
下 is an indicative character: a long horizontal line represents a reference level, and a shorter stroke placed beneath it points to the area below. The original meaning 'below, down' comes directly from this spatial diagram, and it later extended to verbs like 'descend' and 'lower'.
棋 — wood 木 + its 其 (phonetic)
棋 is a semantic-phonetic compound. The wood radical 木 indicates the material, since traditional board game pieces were carved from wood, while 其 (qí) supplies the sound. It originally referred to chess or weiqi pieces and now means chess or board games generally.