adj. phr. 1. Not in good condition; not able to perform well. Father was out of shape when he took a long hike with the boys, and he was stiff and sore the next day. Jack's pitching arm got out of condition during the winter, when he wasn't using it.
Compare: OUT OF PRACTICE. 2. Not look the same; changed. Someone sat on father's new hat and mashed it. It is now out of shape.
Antonym: IN SHAPE.