Idioms can be a powerful linguistic tool only when they are used in the right way in the right places.
Idiom:
have a weakness for (someone or something)
Meaning:
to be unable to resist someone or something
Example:
The girl has a weakness for chocolate and is always eating it.
List of common idioms, their meanings and examples of their usage in sentences
An expression in the usage of a language that is peculiar to itself either in having a meaning that cannot be derived from the conjoined meanings of its elements or in its grammatically atypical use of words.