An IRON is a four-letter device used to straighten collars, and a triceps is a seven-letter muscle located in the upper arm. A METROSEXUAL is an eleven-letter term used to describe a man who is very conscious of his appearance and takes great care in grooming himself. A COMB is a four-letter tool used for styling hair, and Eton is a four-letter style of collar that is often straightened with a collar straightener. Finally, ARREST is a six-letter term meaning to take into custody or detain.