treadmill

[tred-mil]

tread·mill

[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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Treadmill is always a great word to know.
So is zedonk. Does it mean:
the offspring of a zebra and a donkey.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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