Note to Romeo and Juliet, 2.4.209: "Ah. mocker! that's the dog's name; R is for the ..."


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Romeo and Juliet,
Act 2, Scene 4, line 209
that's the dog's name: The letter "R" was thought to sound like a dog's growl.

R is for the—: Apparently the Nurse has thought of another bad thing that "R" could stand for, such as "arse."