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Idiomatic expression
Please explain

If a person believes a lie, then noodles are hanging from their ears, as the old saying goes :)
Lies are free, and noodles are cheap :)

This is one word in many sentences

Something like this

You a teacher

Lol, I'm a bad teacher :)
But if one day someone tells you a lie, tell them: Don't pull the wool over my eyes! :)

But was there a lie between?

Was there a lie at all.