Hypertext Webster Gateway: "gazump"
From WordNet (r) 1.7 (wn)
gazump
v 1: rip off; ask an unreasonable price [syn: {overcharge}, {soak},
{surcharge}, {fleece}, {plume}, {pluck}, {rob}, {hook}]
[ant: {undercharge}]
2: raise the price of something after agreeing on a lower price
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