in the know
Meaning: If someone is "in the know", they know something that only a few people are aware of.
- Maggie is close to the Prime Minister, so she's usually in the know when it comes to the government's latest plans.
- Before you buy your new computer, ask David about getting a good deal. He's in the know about all that stuff.
Tina's boyfriend is in the know when it comes to local horse-racing, so if he tells her which horse to bet on, she should