an old chestnut(redirected from a hoary old chestnut)
A topic, saying, or joke that has been repeated so much that it has become boring or irksome. Whether there's truth in it or not, I can't stand that old chestnut "follow your heart."
an old chestnutor
a hoary old chestnutmainly BRITISH
COMMON If you describe something that is said or written as an old chestnut or a hoary old chestnut, you mean that it has been repeated so often that it is no longer interesting. Finally, how do you answer that old interview chestnut: `Why should I hire you?' The film is based on the hoary old chestnut of good twin/bad twin, separated at birth, final fatal meeting — you get the idea.