Picture one small bell being shaken, or two thin glasses touching: a high, clear little sound that comes several times rather than once — ting, ting, ting. It is small enough that you have to be fairly near to hear it, and pleasant enough that nobody minds. Everything this word does grows out of that one small sound: the sound itself, the thing that makes it, the old telephone that used it to call you, and a soft word for something a small child does.
From the word’s history
One source records tinkle as Middle English tinclen, made of tink (one small sharp sound) plus -le, the ending that says an action happens again and again. That is why the sound in this word repeats: not one ting, but ting-ting-ting.
Wiktionary 記錄 tinkle 來自中古英語 tinclen，由 tink（一下細小尖銳的響）加上 -le 構成；-le 這個字尾表示動作一再重複。所以這個字裡的聲音天生就是連續的：不是一聲 ting，而是叮叮叮。
Wiktionary 'tinkle' (kaikki extract 3f6f69a190036ae4:751547473): Middle English tinclen, equivalent to tink + -le (frequentative suffix)
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