noun
a lengthy, impassioned speech or piece of writing that strongly criticizes or denounces someone or something
verb
to speak or write at length in a critical or angry manner
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During the meeting, the CEO went on a lengthy rant about the importance of company values.
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My friend always goes on a rant about his favorite sports team whenever they lose a game.
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I can't stand when people start ranting about things they don't understand.
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Her mind was like a never-ending rant, filled with thoughts and opinions that she couldn't keep to herself.