bait and switch
英 [ˌbeɪt ən ˈswɪtʃ]
美 [ˌbeɪt ən ˈswɪtʃ]
诱购，诱饵和调换，“上钩调包”诱售法
英英释义
noun
- a deceptive way of selling that involves advertising a product at a very low price in order to attract customers who are then persuaded to switch to a more expensive product