IPA: /məˈsɑːʒər/
KK: /məˈsɑːdʒər/
A person who gives massages or a device used to help relax muscles by applying pressure.
After a long week, I treated myself to a session with a professional massager.
Massager → It is formed from "massage" (from French *massager*, meaning to knead or manipulate) and "-er" (meaning a person who). A massager is a person who performs the act of kneading or manipulating the body to relieve tension or pain.
Think of someone who 'kneads' or 'manipulates' the body — that's what a massager does.