jack something up
phrasal verb with jack verb uk/dʒæk/ us/dʒæk/
(LIFT)
用起重器顶起，用千斤顶托起
to raise a heavy object such as a car off the ground with a jack
(INCREASE)
informal disapproving（突然大幅地）提高（价格）
to increase the price of something suddenly and by a large amount
Once the tourists arrive, the restaurants jack up their prices. 游客一到，餐馆就大幅提价。