cave-in

noun
1
the fact of something suddenly collapsing
فروریختگی, ریزش
2
the act of finally doing what somebody wants after you have been opposing them
تسلیم شدن, رضایت دادن, نرمی نشان دادن, کوتاه آمدن
This cave-in looks weak and pathetic from such a clever politician.
see also cave in (to something)