The Collaborative International Dictionary
To harp on one string
Harp \Harp\, v. i. [imp. & p. p. Harped (h[aum]rpt) p. pr. & vb. n. Harping.] [AS. hearpian. See Harp, n.]
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To play on the harp.
I heard the voice of harpers, harping with their harps.
--Rev. xiv. -
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. [Colloq.]