a musical instrument that consists of an upright frame, roughly triangular in shape and fitted with parallel stings that can be tuned to different keys, played by plucking the strings;
e.g. A harp made of shiny wood stood in the corner of the room.
(verb)
to dwell on a particular topic, either in speaking or writing, and continue to return to it in a persistent, tiresome, and tedious (used as "harp on");
e.g. He loved nothing more than to harp on the government and its shortcomings.