Picture something tall that has been standing steady: a stack of plates, a statue, a tower of blocks. It leans a little, then a little more, and then the whole thing goes over in one piece. The word marks the moment balance is lost and the fall that follows. Because the picture needs height, it fits stacked and standing things — and it fits anyone sitting at the top of something, too.
From the word’s history
Wiktionary gives the word as top plus -le, an ending that marks a repeated action. The sense of something at the top wobbling again and again until it goes over sits directly under every modern use.
Wiktionary 記的來源是 top（頂端）加上 -le，這個字尾表示反覆的動作。頂端一直晃、一直晃，最後整個下來，這個想法就墊在它現在所有用法底下。
Wiktionary etymology supplied in the evidence packet (kaikki:3f6f69a190036ae4:836395287): From top + -le (frequentative verb suffix).
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