Idioms are phrases which cannot be understood simply by looking at the meaning of the individual words in the phrase.
hem (someone or something) in or hem in (someone or something)
to trap or enclose someone or something
We went to the football game but we felt hemmed in by all of the people.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is a widely used saying or expression containing a figurative meaning that differs from the phrase's literal meaning.