treadmill

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. an exercise device consisting of an endless belt on which a person can walk or jog without changing place (Freq. 1)
• Hypernyms:
exercise device
2. a mill that is powered by men or animals walking on a circular belt or climbing steps
• Syn:
treadwheel, tread-wheel
• Hypernyms:
mill, grinder, milling machinery
3. a job involving drudgery and confinement
• Syn:
salt mine
• Hypernyms:
occupation, business, job, line of work, line