A rant is an angry or passionate talk about something that really bothers you. It's like when someone has had enough and just starts expressing themselves freely.
When people say "I'm going to go on a rant," it usually means they're about to start talking loudly, quickly, and strongly about something that's upsetting them. This can be anything from politics or social issues to personal problems or annoyances. They might be trying to convince someone of their point of view or just letting off steam. Sometimes rants are meant as a warning or an alert to others, saying "Hey, pay attention to this!" But other times they're just a way for people to express themselves freely, even if it means getting a bit carried away.
A criticism done by ranting.
To speak or shout at length in uncontrollable anger.
