Learn what "your sister has been lying to you" means, when people say it, and how to use it naturally in English.

It means the speaker says that someone has not been telling the truth.
From The Dumb Billionaire Heiress In Love Part Ii, Episode 37
The speaker is revealing that one person has been dishonest with another.
Use this when you want to tell someone that another person has been dishonest. It can start conflict quickly, so be careful with tone.
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