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.
Idiom:
stand over (someone or something)
Meaning:
to watch someone or something closely, to keep checking someone or something all the time
Example:
The father stood over his son to make sure that he was studying for his final exams.
List of common idioms, their meanings and examples of their usage in sentences
Idioms can be a powerful linguistic tool only when they are used in the right way in the right places.