"I had to pay an arm and a leg for this stereo" is an example of... idiom
metaphor
personifcation
simile​

While looking at ads on a professional job site, justin saw this job posting: "the employee should have a degree in human behavior and at least 5 years experience in behavioral modifications. we are also looking for an employee who is good at crisis divergence. typically employees will spend a lot of time supporting others."