1) Ask an unreasonable price 2) Cheat 3) Chisel 4) Fleece 5) Hook 6) Overcharge 7) Pluck 8) Plume 9) Rip off 10) Soak 11) Surcharge 
In selling and buying property, a term used to describe when a purchaser has an offer accepted by the vendor but is then gazumped because someone else makes the vendor a higher offer which the vendor then accepts instead of the first person's offer
When an accepted offer is beaten by a rival purchaser with a higher offer
Gazump is British slang for to cheat in a house purchase by raising the selling price at the last moment after an agreement has been reached, but before contracts have been formalized.
[v] - raise the price of something after agreeing on a lower price