My dictionary lists a few where the translation is the same but I dont think they have the correct meaning. "Relent" "retreat" "concede" ( maybe this one?)
1Give in (to sth): to finally agree to something that someone wants after first refusing: If you want them to give in you'll have to offer them more than that. Cambridge Dictionary– user5267Oct 26, 2016 at 11:36
2If you want something informal, you can use "cave in" - to give in to someone or something, yield. ("Finally, the manager caved in to the customer's demands". "I refuse to cave in under pressure from my opponent"). I hear this especially when game developers cave in to players requests when they whine about features that make the game too hard for them.– MorganFROct 26, 2016 at 12:07
has the meaning of reluctantly agreeing, converting over, after putting up some sort of resistance.
Two other words with the same implied meanings are
You could also try: Yield, concede (defeat), admit (defeat), give up, back down or throw in the towel.
Another alternative is succumb which means to give in to a force stronger than oneself. It suggests almost powerlessness. Here is the definition: http://www.thefreedictionary.com/succumb