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| English | Russian |
| let in on a secret | посвятить кого-либо в тайну |
| let in on a secret | открыть секрет (I'm going to let you in on a little secret. If you tell them that you're a local, they'll give you a nice discount. – открою тебе небольшой секрет ART Vancouver) |
| let smb. in on a secret | посвятить кого-л. в тайну |
| let in on secrets | посвящать в секреты (VLZ_58) |