it's someone's funeral

• that's someone's funeral

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it's someone's funeral

1. (informal) Someone's decisions or actions will bring undesirable consequences only on that person.
   • 1928, D[avid] H[erbert] Lawrence, Lady Chatterley’s Lover, authorized British edition, London: Martin Secker […], published February 1932 (May 1932 printing), →OCLC:

     He can make as many empty tubes and corrugations out of me as he likes. It's his funeral.

   • 1936, Caroline Slade, Sterile Sun:

     And then having the nerve to pray to God. It's her pimp, if she wants to do it it's her funeral.

   • 1946, Winston Clewes, Sweet River in the Morning:

     "Well, it's your funeral," Charlie said. "If you like it, I should worry." "Who says I like it?" the other lad said, angrily. "What else can I do?"

• on one's head
• (to be) to blame

• “it’s your funeral”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.
• “it s your funeral” in Longman Dictionary of Contemporary English, Longman.
• “that s it s your funeral”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present.