student asking question

What does this phrase mean? Written all over someone’s face?

teacher

Native speaker’s answer

Rebecca

"It's written all over your face" is an idiom that means that you can tell how someone is feeling or what is going on because of their facial expression. Ex: You're lying to me, it's written all over your face. Ex: Did you eat my food? I can tell you did, it's written all over your face.

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