A once-in-a-lifetime experience.

Meaning

The experience was unique and unlikely to be repeated.

Examples

• John: 'Trekking to Everest Base Camp was an incredible journey.'<br>
• Alice: 'Definitely <b>a once-in-a-lifetime experience.</b>'
• John: 'Sounds like <b>a once-in-a-lifetime experience.</b>'
• Alice: 'Witnessing the Great Migration was absolutely amazing.'<br>