[tred-l] 
noun, verb, -dled, -dling.| 1. | a lever or the like worked by continual action of the foot to impart motion to a machine. |
| 2. | a platform, as on a bus or trolleycar, for opening an exit door. |
| 3. | to work a treadle. |
| tread·le (trěd'l) n. A pedal or lever operated by the foot for circular drive, as in a potter's wheel or sewing machine. intr.v. tread·led, tread·ling, tread·les To work a treadle. [Middle English tredel, from Old English, step of a stair, from tredan, to tread.] tread'ler n. |
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