The term 'jack up' is a phrase that can be used to describe a variety of actions, such as increasing, jumping, boosting, lifting, raising, hiking, rising, hoisting, elevating, inflating, and buttressing. All of these words are synonyms for the phrase 'jack up, ' which means to INCREASE or RAISE something. This phrase can be used to describe a variety of situations, such as raising prices, increasing wages, or lifting weights.