Is it correct to say “lesson learnt”? Or can it be rephrased? What does it mean?

The phrase "lesson learnt" is indeed correct, particularly in British English. It means that an individual has gained understanding or knowledge from a past experience, often one that was challenging or involved a mistake. In American English, you might see "lesson learned" more commonly. Both phrases convey the same idea, emphasizing the idea of taking something positive away from a negative experience. If you're looking to rephrase it, you could say: - "valuable lesson learned" - "lesson gained" - "insight acquired" - "knowledge obtained from experience" Each of these alternatives maintains the same core meaning but can provide a different nuance or emphasis.