Think of an earphone cable that has been loose in a bag all week. The line only touched itself at first, but every movement wound it a little tighter, and now pulling one end makes the knot worse. That is the whole word: something long wraps around something else and holds it, and the way out is not the way in. English then lends that picture out. A person who agreed to one small favour and cannot now get their name off the papers is in an entanglement. Wire strung in front of a position is an entanglement, because catching and holding is its job. And borrowed it for two particles that can no longer be described one at a time.
From the word’s history
Wiktionary gives it as entangle + -ment: the verb entangle plus the ending that turns an action into a thing. Entangle itself is en- (make into) plus tangle, so the word starts life meaning the act or result of being wound into a tangle.
Wiktionary 記載這個字是 entangle 加上字尾 -ment：-ment 把動作變成名詞。entangle 本身是 en-（使進入）加上 tangle（一團纏在一起的線）。所以這個字從一開始就是「被繞進一團線裡這件事，或是被繞住的結果」。今天的每一個意思，都還看得到這條線索。
Wiktionary, entry 'entanglement', etymology tree (entangle + -ment), packet evidence kaikki:3f6f69a190036ae4:1242708933
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