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A treadle is the flat bar or plate that you push with your foot, again and again, to make a machine turn. Old machines had one: you rocked your foot on the wide iron plate underneath, and a belt carried that movement up to the needle. Spinning wheels, potters' wheels, and small printing presses all had them too. The idea is always the same — your foot does the work, so both hands stay free. Because these machines belong mostly to the past, the word feels old and a bit specialist now; you meet it in museums, in craft shops, in descriptions of antiques, and often as part of a longer name like 'treadle machine'. It also works as a verb: to treadle is to work such a machine with your foot. A useful thing to notice is that a treadle rocks or is pushed down to turn a wheel, while a pedal (on a bike) goes all the way round with your foot on it.
（縫紉機、紡車的）腳踏板
原始詞典資料5 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
treadlenoun/ˈtɹɛdl̩/
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A foot-operated pedal or lever that generates motion.
- To the rear end of the shaft B, is attached a band wheel, to the periphery of which is attached a strap J, which descends to a treadle, to be operated by the foot, but which requires no description.
- There is an inconspicuous treadle let into the floor and when you step on it an air-operated door-opening mechanism is automatically activated; [...].
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A device actuated by wheels passing over it.
- As a car enters the parking area the front wheels pass over a treadle, causing a timber barrier to lift and allow the motorist to drive in and park. No money is required at this stage. As the car passes over a second treadle, just beyond the entrance, the barrier falls again.
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biologynatural-sciencesChalaza.
treadleverb/ˈtɹɛdl̩/
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To use a treadle.
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businessmanufacturingtextilesTo press a specific treadle or sequence of treadles on the loom.
- You can play with treadling a straight or point twill, treadle just Block A, treadle just Block B, or mix and match all the options.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。