dampsquib

noun
UK /ˈdæmp skwɪb/
US /ˈdæmp skwɪb/

A dampsquib is a firework that fails to go off.

The dampsquib fizzled in the grass and never made a bang.


OTHER MEANINGS

2. A plan or event that ends in disappointment.

The party turned out to be a dampsquib.

3. A person who ruins the fun for everyone.

Don't be a dampsquib and spoil the game.

4. Something that starts with excitement but quickly fades.

His big idea was a dampsquib from the start.