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The person who steers a ship or boat — the one holding the wheel or the and keeping the boat on course. On a big ship the captain decides where to go; the steersman actually turns the wheel and follows the orders. The word sounds old and slightly literary now. On a modern ship you would more often hear 'helmsman', and in the navy the person on duty at the wheel is simply 'the helm'. You will meet 'steersman' most in older stories, sea poems, translations of old texts, and in and dragon-boat contexts, where the steersman sits at the back and controls the direction while the crew . That last use is very live in Taiwan, because of dragon-boat racing at 端午節. Writers also use it as a picture for a leader: 'the steersman of the nation' means the person guiding a country — a phrase with a grand, sometimes political flavour. The plural is steersmen.
舵手。划龍舟時船尾掌舵的那位就是 steersman；比喻用法指「掌舵的人、領導者」
組成steer (掌舵) + -s- (a linking s) + man (人). Literally 'the man of steering'. The little -s- in the middle is the old possessive, the same joint you see in 'craftsman' and 'salesman'.
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
steersmannoun/ˈstɪəz.mən/
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nauticaltransportOne who steers a ship or other vessel; the helmsman.
- And as for a tiller, the whale-boat never admits of any such effeminacy; and therefore as in gamming a complete boat’s crew must leave the ship, and hence as the boat steerer or harpooneer is of the number, that subordinate is the steersman upon the occasion, and the captain, having no place to sit in, is pulled off to his visit all standing like a pine tree.
- The Indian canoe races were the most exciting of all the Regatta. Ten paddles dipped as one paddle, ten men bent as one man, while the steersman kept time for them with grunting bows.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。