Idioms are phrases which cannot be understood simply by looking at the meaning of the individual words in the phrase.
Idiom:
have (something) in mind
Meaning:
to be thinking about something, to be considering something, to have a plan or idea in one's mind
Example:
I do not know what my friend has in mind so I will ask him later.
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.