bait-and-switch
noun /ˌbeɪt ən ˈswɪtʃ/
/ˌbeɪt ən ˈswɪtʃ/
[countable, usually singular]- a selling method where advertisements for low-priced products are used to attract customers, who are then persuaded to buy something more expensive
诱售法(以廉价商品招徕,再兜售较高价商品)