Dictionary![]() ![]() sit-upPronunciation: (sit'up"), [key] —n. an 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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