ˈculture ˌshock noun [singular, uncountable]
the feeling of being confused or anxious that you get when you visit a foreign country or a place that is very different from the one you are used to:
India is where I first experienced real culture shock.
Moving to London was a bit of a culture shock after ten years of living in the country.

[TahlilGaran] Dictionary of Contemporary English ▲

culture shock
feelings of being confused or surprised that you have when you are in a country or social group that is very different from your own.
The first time she went to Japan, Isabel got a huge culture shock.

[TahlilGaran] English Idioms Dictionary ▲