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Blinking alone cannot indicate lying.

Blinking and pupil dilation can occur when someone is stressed but also when they are aroused or highly interested in something. If it is caused by stress it could be possible that the person is lying, especially if they are not usually stressed when talking to others.

If blinking and pupil dilation occurs with a cluster of other indicators then they might be lying. It is easier to know if someone is lying if you know them well because you will know their common and natural body language.