Come-on (noun)

1. An action or remark intended to entice or persuade someone to do something.
2. A seductive remark or action.

Origin:

Early 20th century: from come on! used to encourage or entice someone to do something.

Examples:

1. The salesman's offer was just a come-on to get you to buy more expensive products.
2. The free trial was a come-on to get you to subscribe to the service.
3. She gave him a come-on glance and he was hooked.
4. The cheap prices were just a come-on to get you in the door.
5. The come-on line didn't work, and she walked away.