meaning of "damp squib"

[Marfa]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #23 "Idioms with prepositions", question 7

We thought it would all go off very well but in the end it turned out to be a damp squib.

(a) wet thing
(b) failure
(c) lot of rain
(d) complaint

English Idioms and Expressions, Advanced Level

ESL/EFL Test #23 "Idioms with prepositions", answer 7

We thought it would all go off very well but in the end it turned out to be a failure.

Correct answer: (b) failure
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i dont know what squib means?

Marfa

[Conchita]

A squib is a small firework that bangs.

A damp squib is something exciting/new that doesn't work properly.