0 to fasten something over someone's mouth so that they cannot speak -- вставлять кляп
1 to prevent someone from giving their opinion or giving information about something -- заставить замолчать, заткнуть рот
The government is trying to gag the press over the issue.
2 to feel that you are going to vomit -- давиться, вызывать тошноту
3 a joke or funny story -- шутка, острота
4 something that is fastened over someone's mouth to stop them speaking -- кляп