Learn what "you are going to regret underestimating me" means, when people say it, and how to use it naturally in English.

It means the speaker is threatening consequences for not taking them seriously.
From A Love Once Betrayed, Episode 8
A character threatens revenge by saying the other person will regret underestimating them.
Use this in a serious confrontation or revenge scene. It sounds aggressive and should not be used casually.
Scenes unlock real expressions as you watch
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