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treadle (n.)
[treadle 词源字典]
"lever worked by foot," c. 1400, from Old English
tredel
"step, stair, sole of the foot," from
tredan
"to tread" (see
tread
(v.)) + instrumental suffix
-el
(1). Compare
handle
(n.).
[treadle etymology, treadle origin, 英语词源]