if not

idiom

Definition of if not

1 used to talk about the negative result or effect of somethingYou should study. If not, you won't pass the test.
2 used to express surprise about meeting someone when it is not expectedSo I went to the game and who should I see there if not my old friend Tom!

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“If not.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/if%20not. Accessed 2 Dec. 2020.

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