give in phrasal verb ( see also ↑ give )
1 . to finally agree to do or accept something that you had at first opposed, especially because someone has forced or persuaded you to:
Eventually I gave in and accepted the job on their terms.
Bob’s wife went on at him so much that eventually he gave in.
give in to
The government refused to give in to their demands.
2 . to accept that you are defeated in a game, fight, competition etc ⇨ surrender :
The rebels were eventually forced to give in.
We will carry on fighting to the end. We will never give in.
3 . give something ↔ in British English to give a piece of work or something you have written to someone in authority SYN hand in :
You were supposed to give this work in four days ago.
Rose decided to give in her notice (=officially say she was going to leave her job) .
give something ↔ in to
All assignments must be given in to your teacher by Friday.