IPA: /ˈlɪŋɡər/
KK: /ˈlɪŋɡər/
A person who stays in a place longer than necessary, often without a clear purpose.
The lingerer at the café seemed to enjoy watching the world go by.
Lingerer → It is formed from "linger" (from Old English *lingrian*, meaning to be slow or to delay) and "-er" (meaning a person who). A lingerer is a person who delays or stays longer than necessary.
Think of someone who is 'slow' or 'delaying' ('linger') and the '-er' just means a person. A lingerer is someone who stays longer than they should.