Picture a handful of gravel: dozens of small hard pieces, and not one of them smooth. That is where the word starts, and it leaves a very particular kind of roughness behind it — roughness made of little bits, not one flat surface. You can meet that roughness under your feet on a path, and you can meet the same roughness inside the sound of a voice.
From the word’s history
The source entry supplied in this packet traces gravelly to Middle English gravelli, meaning covered with gravel or sand, formed from gravel plus the adjective ending -ly. The stones are the older picture; the voice use borrows it.
本包附的來源條目說 gravelly 來自中古英語 gravelli，意思是「鋪滿碎石或沙的」，由 gravel 加上形容詞字尾 -ly 組成。石頭是比較早的畫面，聲音的用法是後來借過去的。
Wiktionary entry supplied in this packet (source_ref kaikki:3f6f69a190036ae4:1438689085:15409), etymology_text field.
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