Harp on

Meaning

To repeatedly and boringly speak about a topic.

Origin

This term is known from the 16th century. A quotation from a 1562 work is included in Apol. Private Masse, 1850:

"The great matter you harp on."

Shakespeare also used it later in Hamlet, 1602:

"Still harping on, my daughter?"

See other phrases and sayings from Shakespeare.