"Empowering Advanced Learners of English in Business and Academia - TOEFL / ESL / EFL"
In sales and marketing, to lure a customer with one product but offer them a substitute instead.
Context : Business
Video example (click "CC" to view the text as it is spoken)
This idiom can be used in any setting to refer to tricking someone with one thing but providing them with another.
Usage of “bait and switch”
The department store pulled a bait and switch. They got me to the store with their advertisement, but they "ran out" of the product once I got there.
There should be laws against the "bait and switch."
Examples of idiom “bait and switch” from Twitter