"beeves" is archaic. I forget where I've seen it, but I'm pretty sure it's Modern English. If not, it's certainly Middle English. It's in the same family as leaves, wives, knives, lives etc. It might still be around but that we hardly ever use "beef" in the sense of "male cow" as opposed to the mass noun sense of "meat". As it is, the irregular form doesn't see enough use to be retained. If it were, we might well see "beeves" as the plural of "male cow" and "beefs" as the plural of "complaint" (which is to be expected in any case -- see Pinker's Words and Rules for more). -dmh 05:15, 17 Jun 2004 (UTC)
Is this UK or obsolete? --Connel MacKenzie 19:11, 30 June 2007 (UTC)
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Rfv-sense: "(countable) Would be "a side of beef". A chunk, cut or piece not being the whole piece, compare ham."
I'm not sure what was intended, but what is written seems to define "beef" as meaning "a (countable) piece, chunk or side of (uncountable) beef. I am unfamiliar with this usage and don't find it in MWOnline, which usually has the largest number of senses and subsenses among on-line dictionaries. MW does have a countable sense, "a dressed carcass of a beef animal", which I had also not heard before. This would presumably be two "sides" of beef, contrary to "a side" of beef as our challenged sense states. DCDuring TALK 14:50, 3 November 2010 (UTC)
The "complaint or disagreement" sense is uncountable in rap music culture. A rapper has "beef" with somebody, not "a beef". Equinox ◑ 13:40, 14 August 2012 (UTC)
(plural beeves or beef) animal used for beef Microsoft® Encarta® 2009
--Backinstadiums (talk) 16:55, 14 March 2020 (UTC)