WordReference Random House Learner's Dictionary of American English © 2026
ˈsit-ˌup,
n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Medicine, Sportan exercise in which a person lies flat on the back, lifts the upper body to a sitting position, and then lies flat again without changing the position of the legs.
sit-up
(sit′up′),USA pronunciation n.
- Medicine, Sportan exercise in which a person lies flat on the back, lifts the torso to a sitting position, and then lies flat again without changing the position of the legs: formerly done with the legs straight but now usually done with the knees bent.
- noun, nominal use of verb, verbal phrase sit up 1835–45
'sit-ups' also found in these entries (note: many are not synonyms or translations):