Mother-of-all meaning

(colloquial) Used before a plural noun to form a compound noun having the sense of: the greatest or largest of its kind.
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Origin of mother-of-all

  • Popularized after its use by Saddam Hussein, then president of Iraq, in reference to the Gulf War as ام المعارك (umm al-ma‘ārik, “mother of battles”).

    From Wiktionary