know something backward and forward

idiom

Definition of know something backward and forward

: to know something completely He knew the process backward and forward.

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Cite this Entry

“Know something backward and forward.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know%20something%20backward%20and%20forward. Accessed 20 Jun. 2021.

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