Putting a crimp in refers to limiting or hindering something. Its antonyms could include facilitating, promoting, aiding, or assisting. When one puts a crimp in a plan or idea, it means they are creating an obstacle or barrier. The opposite of putting a crimp in would be to remove obstacles, assist in the performance of the plan, and aid in its successful execution. The term can be used in different contexts, such as in business, personal relationships, and politics. Whatever the context, the antonyms to putting a crimp in would involve promoting the accomplishment of a goal or objective.