one thing is (for) sure

idiom

Definition of one thing is (for) sure

: it is certain : certainly One thing is (for) sure, we'll never eat there again.

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“One thing is (for) sure.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/one%20thing%20is%20%28for%29%20sure. Accessed 5 Dec. 2020.

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