the mother of all

idiom

Definition of the mother of all

: used to say that something is larger, better, worse, etc., than all other things of the same kindIt has been described as the mother of all construction projects.

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“The mother of all.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/the%20mother%20of%20all. Accessed 4 Aug. 2020.

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