Picture a hand held out flat, palm up, fingers apart. Two things are true of that hand at once: nothing is gripped in it, and nothing is hidden under it. Because nothing is gripped, whatever is in the hand can leave it — money, time, help. Because nothing is hidden, the person facing you can see exactly what you are carrying, which is why an open palm has long meant both giving and peace. Every use of this word is one of those two readings of the same hand.
可以想成一隻攤平的手，掌心朝上，手指張開。這隻手同時說了兩件事：手上沒有握緊什麼，手下也沒有藏什麼。因為沒有握緊，手上的東西就容易出去——錢、時間、幫忙都是。因為沒有藏，對面的人看得到你手上有什麼，所以攤開的手一直同時代表「給」和「沒有惡意」。這個字的每一種用法，都像是在讀這隻手的其中一面。
From the word’s history
Formed from open + handed, so the word says the hand is open and the rest follows from that.
由 open（打開的）＋ handed（有…手的）組成，字面就是「手是打開的」，其他意思都從這句字面長出來。
Wiktionary (kaikki extract, open-handed): From open + handed.
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