I'm not totally sure you aren't being cheeky here, but - Cave in (to someone/thing) means to stop resisting their pressure and accept their terms (while not being happy to do so)
The government caved in to the demands of the protesters. She caved in to her family and dumped her boyfriend.
Well, I'm not aware of the cultural differences in meaning, but the first word is literally "euphoria" transliterated into the Hebrew script. I'm a complete beginner in Hebrew, but the machine translation sounds pretty much on point to me. "The euphoria lived for a short time" or simply "The euphoria was short" is the most literal version possible.