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In a nutshell 

means to summarize something in a short, simple, and concise way. It’s used when you want to quickly convey the most important details without too much explanation.

Examples:

1- We had a three-hour meeting, but in a nutshell, the boss just told us to cut expenses.

2- When asked about his success, a famous actor said, ‘In a nutshell, hard work and luck got me here.