Tip-off (noun)

1. A piece of information or a warning that allows someone to take action in advance.
2. The start of a game or event.

Origin:

Early 20th century: tip-off, from the verb tip off, meaning to give a secret or advance warning.

Examples:

1. The police received a tip-off about the drug deal.
2. He got a tip-off about the exam questions.
3. The tip-off of the game was at 7pm.
4. The informant gave them a tip-off about the location of the stolen goods.
5. They received a tip-off about the planned attack.