A damp squib

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British Origin

The phrase is more common in British English than American English, where it might be less recognized.

I mentioned the event was a damp squib, but my American friend didn't understand the expression.

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Use in Disappointment

Use when describing events, projects, or plans that are less exciting or successful than expected.

The launch party was a damp squib because hardly anyone showed up.

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Metaphorical Use

It's often used metaphorically and not taken literally, referring to the 'fizzle out' aspect of an expectation.

The much-awaited sequel to the game was a damp squib compared to the original.