(added to verbs) A person or thing that does an action indicated by the root verb; used to form an agent noun. · (added to verbs, informal) A person or thing to which the root verb is done or can be done satisfactorily.
词源说明
The singer was born Destiny Hope Cyrus but nicknamed Smiley (later Miley) by her parents because she often smiled as a baby; hence smile + -er.