Not all native speakers of English use the language correctly.
Sometimes we make mistakes. These can come in many forms,
such as a grammatical error or a careless slip of the tongue.
A slip of the tongue is a error made whilst saying something.
This can be in the form of a factual error, or just a simple misplaced word.
Some English idioms are often said wrongly. A good example is the phrase – ‘damp squib’.
Instead of ‘squib’, some people say ‘squid’, which is a type of aquatic animal.
The correct word is ‘squib’, which is a small firework.
So a damp squib is something that promises to be exciting or interesting,
but turns out to be a disappointment. A damp firework will not go bang,
so we say ‘damp squib’. ‘’Last night’s party was supposed to
be the best of the year, but it turned out to be a damp squib.’’
Something that promises to be great turns out to be the opposite.