Meaning: to come close to, to be on the verge of doing V (but did not do it eventually).
날씨가 안좋아서 소풍을 못 갈 뻔했다. Since the weather was not good, I almost did not go (=but went anyway).
공부를 열심히 안해서 시험에 떨어질 뻔했다. Since I did not study a lot, I almost failed the test (=but passed anyway).
투자를 많이 했지만 돈을 거의 잃을 뻔했다. Although I invested a lot, I almost lost all my money.
지갑을 안가져와서 결제 못 할 뻔했다. Since I did not take my wallet, I almost could not pay (= but paid anyway)
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