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countable and uncountable, plural chestnuts
A tree or shrub of the genus Castanea. examples
A nut of this tree or shrub. examples
(uncountable) A dark, reddish-brown colour, as seen on the fruit of the chestnut tree. examples
A reddish-brown horse. quotations examples
Lord Carington […] led the way with his chestnuts […]
1871, Baily's Magazine of Sports & Pastimes, volume 20, page 308
[…] browns are the soberest, bays are the worst tempered, and chestnuts are the most foolish.
1877, George Nevile, Horses and Riding, page 105
(uncountable) Wood of a chestnut tree. examples
(figurative) An old joke; a worn-out meme, phrase, ploy, etc. so often repeated as to have grown tiresome or ineffective (often in the phrase "old chestnut"). quotations examples
Yep, this is a dance-leaning cover of the Matthew Wilder '80s pop chestnut. It has already saturated radio airwaves throughout Europe, with a number of programmers here already giving it positive feedback.
1997 May 10, Larry Flick, “Singles”, in Billboard, page 62
Take greed. He’s been cited many times for what now has become a chestnut: “The point is, you can’t be too greedy.”
2015 August 27, Michael Signer, “What Happens When Donald Trump Stirs Up 'Passionate' Supporters”, in The Atlantic
A round or oval horny plate found on the inner side of the leg of a horse or other animal, similar to a birthmark on a human. examples
(UK) The horse-chestnut. examples
not comparable
Of a deep reddish-brown colour, like that of a chestnut. examples