Think of someone coming close and then back again. Flirtation is interest that shows itself but never settles: it gets near enough for the other side to notice, stays for a moment, and leaves nothing behind. Every use of the word keeps that shape — the coming close is real, the staying is not.
From the word’s history
The word is flirt plus the ending -ation, which turns an action into a thing you can talk about, as inform becomes information. So the noun simply names the act of flirting; the other uses grow out of that act.
這個字是 flirt 加上字尾 -ation。-ation 的作用是把一個動作變成一個可以談論的東西，就像 inform 變成 information。所以這個名詞最基本就是「調情這件事」，其他用法都是從這裡長出去的。
Wiktionary entry for flirtation, supplied in this packet (source_ref kaikki:3f6f69a190036ae4:642493257:10277): 「From flirt + -ation.」
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