One way to hold clingy: something has taken hold of you and will not let go. A small child's hands on a parent's sleeve; a thin shirt caught on wet skin. The thing is not simply near you — it is holding on, and it moves when you move.
clingy 可以想成「貼上去就不放開」。畫面像小孩抓著大人的袖子，你走到哪，他就跟到哪；也像淋濕的薄襯衫，一沾上背就攤不開。重點不在靠得近，而在那個抓住不放的動作——你動，它也跟著動。這個字用在哪裡，就看抓著不放的是人，還是布。
From the word’s history
Wiktionary analyses clingy as cling + -y: the verb for holding on tightly, plus the ending that means 'having that quality'.
來源資料把 clingy 拆成 cling（緊緊抓著不放）加上 -y（帶有這種性質）。這條線索正好對上上面的畫面：clingy 說的就是「會一直抓著不放的」。
Wiktionary (kaikki extract) entry for clingy, etymology: 'From cling + -y.' (source_ref kaikki:3f6f69a190036ae4:853950703)
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