Tā cóngxiǎo míliàn dāojiàn, zhǎngdà hòu chéng le yí wèi zhùjiànshī.
He has been fascinated by blades since childhood and grew up to become a swordsmith.
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Strictly speaking 刀 dāo is a single-edged saber/knife and 剑 jiàn is a double-edged straight sword — different weapons. The compound 刀剑 is the umbrella term, much like English 'blades' covers both.
culture
Common in martial-arts (武侠 wǔxiá) novels and games. Set phrase: 刀剑无眼 dāojiàn wú yǎn ('blades have no eyes' — i.e. they don't recognize friend or foe; combat is dangerous).
