One way to hold swordsman: a man with a blade in his hand, and the word is not pointing at the blade. It is pointing at what he can do with it. Anyone can carry a sword; a swordsman is the one who has the skill, and the word carries a little admiration for that skill wherever it goes.
可以想成這個畫面：一個男人手上握著一把劍——而這個字指的不是那把劍，是他用劍的本事。誰都可以拿著劍，但 swordsman 是那個真的會用的人。這份「有本事」的味道，不管這個字走到哪個用法裡都還留著，只是被用在什麼事情上會變。
From the word’s history
From sword + -s- + man.
來源可以想成 sword（劍）＋ -s- ＋ man（人），字面就是「用劍的人」。中間那個 -s- 跟 sportsman、craftsman 是同一個接縫。
Wiktionary entry for swordsman (kaikki extract, source_ref kaikki:3f6f69a190036ae4:1286981394): "From sword + -s- + man."
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