noun
ADJECTIVE
▪ big , enormous , great , major , massive
▪ cultural , economic , emotional , political , social
▪ violent
▪ revolutionary
VERB + UPHEAVAL
▪ cause
▪ experience , go through , undergo
▪
The company underwent a massive ~ after the takeover.
PREPOSITION
▪ during the ~ , in the ~
▪
He rose to power during the political ~s of the 1990s.
PHRASES
▪ a period of ~