Harp, v. i. [imp. & p. p.Harped (härpt) p. pr. & vb. n.Harping.] [AS. hearpian. See Harp, n.] 1. To play on the harp.
I heard the voice of harpers, harping with their harps. Rev. xiv. 2.
2. To dwell on or recur to a subject tediously or monotonously in speaking or in writing; to refer to something repeatedly or continually; — usually with on or upon. “Harpings upon old themes.” W. Irving.
Harping on what I am,
Not what he knew I was. Shak.
To harp on one string, to dwell upon one subject with disagreeable or wearisome persistence.