Where does the space go in "ain't"?
Quote:
apostrophe
n.
a mark (') used:
a) to indicate the omission of a letter or letters from a word or phrase (Ex.: o' for of, it's for it is)
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Quote:
Romeo and Juliet (III, i, 94)
A plague o' both your houses!
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Just a guess, but that usage probably pre-dates your school days.