Literary Terms and Author's Craft Practice

"Uncle Vernon made another funny noise, like a mouse being trodden on." This is an example of a:

"Your explanation is as clear as mud." This is an example of:

A mother tells her son she enjoyed watching that horror movie "about as much as a root canal."

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Expressions or terms that are specific to a group of people or a type of profession are known as...

This is apart of author’s craft, and it is used to help bring the writing to life.  This could be exaggeration, comparing things using like/as, or sound words.