treadmill

treadmill

[tred-mil]
noun
1.
an apparatus for producing rotary motion by the weight of people or animals, treading on a succession of moving steps or a belt that forms a kind of continuous path, as around the periphery of a pair of horizontal cylinders.
2.
an exercise machine that allows the user to walk or run in place, usually on a continuous moving belt.
3.
any monotonous, wearisome routine in which there is little or no satisfactory progress.

Origin:
1815–25; tread + mill1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
treadmill (ˈtrɛdˌmɪl)
 
n
1.  Also called: treadwheel (formerly) an apparatus used to produce rotation, in which the weight of men or animals climbing steps on or around the periphery of a cylinder or wheel caused it to turn
2.  a dreary round or routine
3.  an exercise machine that consists of a continuous moving belt on which to walk or jog

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