upheaval
US /ʌpˈhiː.vəl/
UK /ʌpˈhiː.vəl/

1.
gejolak, pergolakan, perubahan besar
a violent or sudden change or disruption to something
:
•
The political upheaval led to a change in government.
Gejolak politik menyebabkan perubahan pemerintahan.
•
The company is undergoing a major organizational upheaval.
Perusahaan sedang mengalami pergolakan organisasi besar.