give someone or something back (to someone or something)
to return someone or something to someone or something. Please give it back to me. You took my lunch away from me. You had better give it back. Give back the book right now!
give something back
(to someone) (with interest) 1. Lit. to return money to someone with an additional amount for interest. You are going to have to give that money back to me with interest. Please give back the proper amount... with interest!
2. Fig. to return something to someone in excess of what was received. We will give back all your kindness to you with interest. We will give it all back with interest.