Idiom of the day :- Rock hound

Usage, examples and definition of the Idiom :-

Rover is thrilled with his collection of rocks. If I were a rock hound I suppose I’d be thrilled too, for a rock hound is a person who collects various kinds of rocks and minerals. ‘I’m only an amateur rock hound,’ Rover smiled. ‘My collection is small compared to those of my rock hound friends.’