To rant about something is to complain loudly about it. A person loses his or her temper and speaks at length about something that is causing a problem.
What is he ranting about?
He’s going off on a rant. (go off on a rant = to speak in anger and at great length on something)
Someone videotaped the woman’s rant and put it on YouTube. (The word "rant" is used as a noun in this sentence.)
The woman lost her cool and went off on a rant.
Melinda went off on a rant when her boyfriend borrowed her car and didn’t tell her he was taking it.
The teacher got into a long rant against the students who weren’t listening to her lecture.
A customer came into the grocery store ranting about some rotten oranges he had bought earlier.
I really don’t want to listen to your rant.
The words "rant" and "rave" are often used together:
Everyone is ranting and raving about the traffic situation.
From way down the block we could hear a man ranting and raving about something, but we couldn’t make out what it was.
You can’t rant and rave about the election results if you didn’t vote.
