Definition of the mother of all
:
—used to say that something is larger, better, worse, etc., than all other things of the same kind It 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 18 Jun. 2021.
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