You can picture left-handed as the left hand reaching first. In a world quietly built for the right hand, that one difference spreads outward: the person who reaches with the left, the tools that have to be rebuilt as mirror images for them, the turn that goes the other way round a screw, and — in one fixed American phrase — praise that does not arrive straight.
From the word’s history
The source records left-handed as left + handed, appearing in Middle English as left handyd and lyfthonded. The word is literally the hand plus the side it is on, which is why every later use still starts from a direction.
資料把 left-handed 記成 left 加 handed，中古英文寫成 left handyd、lyfthonded。字面就是「手」加上「哪一邊」。所以後來每一種用法，起點都還是方向。
Wiktionary entry for left-handed (kaikki:3f6f69a190036ae4:521528147): 'From Middle English left handyd, lyfthonded, equivalent to left + handed.'
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