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. [Collog.]