Possibly a folk-etymological alteration offorever and ay.^[1]

foreverandaday (notcomparable)

1. (idiomatic) For a very long or seemingly endlesstime.

   Synonyms:for ever and ever,forever and forever,(archaic)forever and ay,a year and a day

   I'll love youforever and a day.

   • c.1590–1592 (date written),William Shakespeare, “The Taming of the Shrew”, inMr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London:[…]Isaac Iaggard, andEd[ward] Blount, published1623,→OCLC,[Act IV, scene iv],page225, column 2:

     If this be not that you looke for, I haue no more to ſay, / But bidBianca farewellfor euer and a day.

   • 2001, Ian Brown, Francis Dunnery, “Forever and a Day”, inMusic of the Spheres, performed by Ian Brown:

     What you gonna do when you just found forever? / Where you gonna get to when you can't get it together? /Forever and a day

   • 2018 February 2,Alejandro Zambra, “RememberingNicanor Parra, the Almost Immortal Chilean Poet”, inThe New Yorker‎^[1], New York, N.Y.:Condé Nast Publications,→ISSN,→OCLC, archived fromthe original on2023-06-02:

     I went to the front yard, talked for maybe two more hours with Colombina and Rosita, his caretaker, and then we had to leave, but Nicanor still had enough material forforever and a day.

   • 2023 November 17,The Tonight Show Starring Jimmy Fallon‎^[2], episode1878, spoken byScarlett Johansson:

     Honestly, I had acneforever and a day and just struggled to find a routine that addressed my sensitive skin and so I made it!

• “forever and a day”, inDictionary.com Unabridged,Dictionary.com, LLC, 1995–present.
• “forever and a day”, inCollins English Dictionary.
• “forever and a day”, inCambridge English Dictionary, Cambridge, Cambridgeshire:Cambridge University Press, 1999–present.

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