Robert Browning’s 1841 verse drama Pippa Passes, source of the famous lines “God’s in His heaven — All’s right with the world,” ends on a strange note:

But at night, brother Howlet, far over the woods,
Toll the world to thy chantry;
Sing to the bats’ sleek sisterhoods
Full complines with gallantry:
Then, owls and bats, cowls and twats,
Monks and nuns, in a cloister’s moods,
Adjourn to the oak-stump pantry!

When the editors of the Oxford English Dictionary inquired delicately how Browning had settled on the word twats, the poet indicated a 1660 rhyme called “Vanity of Vanities”: “They talk’t of his having a Cardinall’s Hat/They’d send him as soon an Old Nun’s Twat.” There the word had been intended as a dismissive insult, but Browning had taken it seriously. Today’s OED still cites Browning’s usage, noting that he’d used the word “erroneously” “under the impression that it denoted some part of a nun’s attire.”

Editor James A.H. Murray later complained, “Browning constantly used words without regard to their proper meaning. He has added greatly to the difficulties of the Dictionary.”