0 to finally agree to what someone wants, after refusing for a period of time: --
He nagged me so much for a new bike that eventually I gave in.
The government cannot be seen as giving in to terrorists' demands.
1 to accept that you have been defeated and agree to stop competing or fighting: --
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
We kunnen het stap voor stap voltooien, hoe lang de weg ook is en het kan niet worden voltooid, hoe kort de weg ook is, als je niet eens je voetafdruk markeert.