Learn what "i think i've made a major mistake" means, when people say it, and how to use it naturally in English.

It means the speaker believes they did something very wrong or bad.
From The Billionaire’S Lost Love, Episode 0
Someone realizes that they may have made a serious error.
Use this when admitting regret or realizing you may have done the wrong thing. It is common and reusable in everyday English.
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