Let in on the secret là gì

let sb in on Thành ngữ, tục ngữ

let sb in on

Idiom[s]: let sb in on sth

Theme: GOSSIP

to tell someone the secret. [Informal. The something can be a plan, arrangements, scheme, trick, or anything else that might be kept a secret.]
Should we let John in on the secret?
Please let me in on the plan.