1. past tense of harp; to dwell on or keep talking about something in a tedious or annoying way
Usage: often used with ‘on’
2. past tense of harp; to play a harp (musical instrument)

Examples

• She harped on the same complaint for hours.
• He harped about the unfair treatment at work.
• The teacher harped on the importance of good study habits.
• My mother harped on me to clean my room.
• The musician harped beautifully at the wedding ceremony.
• She harped the melody while others sang along.