0 to finally agree to what someone wants, after refusing for a period of time: --
The government cannot be seen as giving in to terrorists' demands.
He nagged me so much for a new bike that eventually I gave in.
1 to accept that you have been defeated and agree to stop competing or fighting: --
If your application is rejected this year, don't give in. You can apply again next year.
She refused to give in, and finally got the opportunity she was looking for.
After struggling with the crossword for an hour, she finally gave in and looked at the answers.
The enemy troops weren't prepared to give in without a fight.
The government finally gave in to the company's plea for help.
Keep asking and eventually she'll give in.
He gave in to my suggestion after I had shown him the plans.