IPA: /ˌæntiˈɡʌvənmənt/
KK: /æntɪˈɡʌvərnmənt/
Opposed to the government that is currently in power or against government in general.
The antigovernment protests drew thousands of people to the streets.
Antigovernment is formed from "anti-" (meaning against) and "government" (from Old French *governer*, meaning to direct or control). The word describes a stance or movement that is against the established government or authority.
Think of 'anti-' meaning against, and 'government' as the system that directs or controls. This helps you remember that 'antigovernment' refers to being against the governing authority.