Longman Dictionary of Contemporary English homepage

treadmill

noun
     
treadmill
Related topics: Power
tread‧mill
1 [countable] a piece of exercise equipment that has a large belt around a set of wheels, that you can walk or run on while staying in the same place
2 [singular] work or a way of life that seems very boring because you always have to do the same things:
the treadmill of working in the office
3 [countable]TP a mill worked in the past by prisoners treading on steps fixed to a very large wheel

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