Definition of not know that in English:

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not know that

informal Used to express one’s doubts about one’s ability to do something: I don’t know that I can sum up my meaning on paper
More example sentences
  • I don't know that there's anything you can do; I think you've got to leave it up to him.
  • I don't know that I can be any more specific than that because there are court proceedings pending.
  • I don't know that I could go back to having a full-time job.
See parent entry: know
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