Picture a lane so full that nobody can walk straight. Shoulders touch shoulders; to move at all you have to turn sideways and push. Throng can be thought of as that pressing itself — not just many people in a place, but people packed until they press on each other. Everything else the word does comes from looking at that same picture from a different side: the mass as a thing (a throng), the bodies arriving (people throng the square), the place after they arrive (thronged with ), and, in writing, things or animals packed the same way.
From the word’s history
The source entry traces throng to Old English þrang / ġeþrang (crowd, press, tumult), from a Germanic root meaning pressing or narrow, and compares German Drang (a pushing force) and Gedränge (a throng). So the pressing in the modern word is not a reading we added to it; it is what the older word named.
來源資料把 throng 追到古英文的 þrang / ġeþrang，意思是「人群、擠壓、騷動」，再往上是日耳曼語裡表示「壓、窄」的字根，同源的還有德文 Drang（推擠的力量）和 Gedränge（人群）。所以今天這個字裡的「擠」，本來就是它最早在講的東西。
Wiktionary etymology supplied in this packet (source_ref kaikki:3f6f69a190036ae4:1051531982:22053)
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