It was “ought” with an O, which means, roughly, “should.” Here’s Webster on “ought”:
—used to express obligation <ought to pay our debts>, advisability <ought to take care of yourself>, natural expectation <ought to be here by now>, or logical consequence <the result ought to be infinity>
“Aught,” on the other hand, is a quaint sort of word that means “anything.”
“No one had aught to say.”
It can also refer to the first decade in a century; so 2000 to 2009 were the “aughts.”
But we don’t use it much. According to the Corpus of Contemporary American English, we use the O spelling about 300 times as often as the A spelling.
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