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

It means the speaker is warning that there will be consequences for not respecting their ability or power.
From Tangled In Desire, Episode 28
Someone is threatening that the other person will regret underestimating them.
Use this in very tense confrontations or fiction-like revenge scenes. It sounds threatening and should not be used casually.
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