harp
Word family
- harpistnounB1
- harpernounC1
Synonym discussion
Sense: verb/2
All four phrases describe talking about something too much, but they differ in tone and structure. 'Harp on' (or 'harp on about') is informal and carries a mildly disapproving tone — the speaker finds the repetition annoying ('She kept harping on about her diet'). 'Dwell on' is more neutral and can refer to thinking as well as speaking ('He dwelt on the problem for days'). 'Go on about' is equally informal and very common in British English, often implying the listener is bored ('They went on about their holiday for hours'). 'Labour the point' is more formal and suggests the speaker is over-explaining something that is already clear ('I don't want to labour the point, but the deadline is tomorrow'). Use 'labour the point' in professional writing; use 'harp on' or 'go on about' in conversation.'Dwell on' works in both speech and writing with a neutral register.
Common collocations
Etymology
The word 'harp' comes from Old English 'hearpe', which goes back to a common Germanic root *harpōn-. This ancient word is related to Dutch 'harp', German 'Harfe', and Old Norse 'harpa'. The instrument itself has existed for thousands of years — harps appear in ancient Egyptian and Mesopotamian art. The verb sense 'to talk persistently' (harp on) developed in the 1500s. The idea is that someone keeps playing the same string over and over, like repeating the same topic again and again. The informal sense 'harp = harmonica' arose among American blues musicians in the early 1900s.