No, 'tis you would be harping upon that string, sir: see you this?
"I can't fathom his motive, Tom," said Richard, harping upon the theme.
Latterly she had been for ever harping upon this one theme,––her duty!
What, is the use of harping upon this subject Sunday after Sunday?
This may be attributed partly to the harping upon a conviction of sinfulness, which in itself is ...