keep harping on something
to continue to talk or complain about something; to keep raising a topic of conversation.
What does it mean to keep harping on something?
US, informal. : to talk about (a subject) constantly or repeatedly in an annoying way She's always harping on the importance of a good diet.
Where does the phrase harping on come from?
For example, She kept harping on the fact that she had no household help at all. This expression is a shortening of harp on the same string, meaning “to play the same note over and over.” It was first recorded in 1518.
