Also means
to rip off
Usage Note
arnaquer is informal/slang for cheating or defrauding someone: se faire arnaquer (to get ripped off) is very common in everyday speech. The noun arnaque (f) means a scam or rip-off. A related person-noun arnaqueur (m) / arnaqueuse (f) means a con artist.
Examples
"Le vendeur m'a arnaqué sur le prix."
Natural Translation
The seller ripped me off on the price.

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