slaughter's the matter!
Upon being asked what's the matter, this character yells "murder's the matter! slaughter's the matter! killing's the matter!" This character's popularity owes a great deal to the actress Jane Green, who played her in the premiere. This character gives Sir Lucius O'Trigger false hope by exchanging flirtatious letters with him. Bob Acres is this character's preferred suitor for her niece. She praises a man for being "the very (*) pine-apple of politeness" and says that a girl is "as headstrong as an allegory on the banks of the Nile". For 10 points, name this guardian of Lydia in Richard Sheridan's The Rivals, a comical woman who lends her name to the practice of using incorrect but similar-sounding words.
Upon being asked what's the matter, this character yells "murder's the matter!
Mrs. Malaprop [do not accept \"malapropism\"]