A once-in-a-lifetime experience.

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Meaning

The experience was unique and unlikely to be repeated.

John: 'Trekking to Everest Base Camp was an incredible journey.'<br>

Alice: 'Definitely a once-in-a-lifetime experience.'

John: 'Sounds like a once-in-a-lifetime experience.'

Alice: 'Witnessing the Great Migration was absolutely amazing.'<br>

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