dump

Topic
Mr Wormwood was a small ratty-looking man whose front teeth stuck out underneath a thin ratty moustache. He liked to wear jackets with large brightly-coloured checks and he sported ties that were usually yellow or pale green. "Now take mileage for instance," he went on. "Anyone who's buying a second-hand car, the first thing he wants to know is how many miles it's done. Right?"
"Right," the son said.
"So I buy an old dump that's got about a hundred and fifty thousand miles on the clock.
Source : Matilda by Royald Dahl

What does that 'dump' mean here?

It's a variation of this meaning (WR dictionary) but applying to a car rather than a place:
a place, area, house, or town that is run-down, dirty, or a mess: He lived in a dump, with no kitchen or bathroom.

He means an old, run-down car that most people would just dump (or discard).

Barque said:

It's a variation of this meaning (WR dictionary) but applying to a car rather than a place:
a place, area, house, or town that is run-down, dirty, or a mess: He lived in a dump, with no kitchen or bathroom.

He means an old, run-down car that most people would just dump (or discard).

Thank you.