trea·dle

[tred-l] noun, verb, trea·dled, trea·dling.
noun
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.
verb (used without object)
3.
to work a treadle.

Origin:
before 1000; Middle English tredel stairstep, Old English. See tread, -le

tread·ler [tred-ler] , noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
treadle (ˈtrɛdəl) [Click for IPA pronunciation guide]
 
n
1.  a.  a rocking lever operated by the foot to drive a machine
 b.  (as modifier): a treadle sewing machine
 
vb
2.  to work (a machine) with a treadle
 
[Old English tredel, from trǣde something firm, from tredan to tread]
 
'treadler
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Treadle is one of our favorite verbs.
So is subtilize. Does it mean:
to bark; yelp.
to introduce subtleties into or argue subtly about.
Etymonline
Word Origin & History

treadle
"lever worked by foot," c.1400, from O.E. tredel "step, stair," from tredan "to tread" (see tread) + instrum. suffix -el (cf. handle).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The treadle valve supply lines in the cab had been cut for removal of the valve and oil was found inside the lines.
The treadle displacement was converted to actual displacement via an electro-mechanical servo.
The beam is broken and an electrical signal is generated when an axle crosses
  the treadle.
The patch machine shall be guarded to prevent the operator's hands entering the
  punch area, and the foot treadle shall be guarded.
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