What will Mrs. Grundy say?

What will the neighbours say? As is mentioned under We are all slaves of opinion, our actions are influenced by what other people may say or think about them.

In a play called Speed The Plough by Thomas Morton and first produced in 1798, Mrs. Grundy is the symbol of conventional propriety. She does not appear in the play, but her neighbour, Dame Ashfield, is constantly afraid of incurring her disapproval.