An idiom is defined as - a group of words in a fixed order that has a particular meaning that is different from the meanings of each word on its own.
to be easily upset or hurt, to be too sensitive
My friend is very thin-skinned and is easily bothered by what other people say.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is a group of words, or in other words, a phrase that has a meaning different from the literal meaning of the words in it.