Which type of figurative language is the phrase, "in over his head"?

An idiom

Explanation:

In over one's head is an idiom that means that someone is involved in something full of difficulty, something that is beyond that person's ability to cope.

in 1636, roger williams settled at the tip of narragansett bay after being banished from the massachusetts bay colony for his religious views, on land granted to him by the narragansett tribe. he called the site "providence plantation" and declared it a place of religious freedom.

explanation:

shakespeare was famous for writing in iambic pentameter, which is a specific way of rhyming sonnet lines in ten syllables. there are also forms of unrhymed iambic pentameter, as in macbeth, with the noble characters.