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Definition of ought:

  1. of Owe
  2. Owned; possessed.
  3. See Aught.
  4. To be bound in duty or by moral obligation.
  5. To be necessary, fit, becoming, or expedient; to behoove; - in this sense formerly sometimes used impersonally or without a subject expressed.
  6. Was or were under obligation to pay; owed.


must, had better, should, need.

Usage examples: