"To borrow that idea" means to take inspiration or adopt a concept or suggestion from someone else and apply it to your own situation or project. Full definition
The variety was endless because builders often borrowed ideas from several different plans and added innovations of their own. (realtormag.realtor.org)
I just may borrow your idea for next year's theme at my home. (stonegableblog.com)
Even people into other professions can refer to this document for borrowing the ideas of format. (template.net)