The phrase "put crimp in" refers to something that causes a disruption or impediment. The antonyms for this phrase could be words or phrases that imply smoothness, ease, or fluidity. For example, the opposite of putting a crimp in someone's plans could be helping them achieve their goals or facilitating their progress. Some potential antonyms for "put crimp in" include smooth out, streamline, facilitate, accelerate, enhance, aid, and support. These words all imply that something is being made easier, rather than hindered or obstructed, and could be used to describe actions or behaviors that promote efficiency and productivity.