Learn what "i'll teach you a lesson you'll never forget" means, when people say it, and how to use it naturally in English.

It means the speaker is warning that they will punish the other person or make them pay for what they did.
From Married To A Stranger, Episode 2
The speaker is threatening to punish or retaliate against someone.
Use this only in very hostile speech or fiction. It sounds threatening and aggressive, not polite or casual.
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