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Phrase(s): It’s your funeral.
Fig. If that is what you are going to do, you will have to endure the dire consequences. • Tom: I’m going to call in sick and go to the ball game instead of to work today. Mary: Go ahead. It’s your funeral. • Bill: I’m going to go into the boss and tell what I really think of him. Sue: It’s your funeral.
McGrawhill's American Idioms And Phrasal Verbs
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Also, it's or it's not his or her or my or our or their funeral. One must take the consequences of one's destructive or foolish actions. This expression is used to show one's contempt or lack of sympathy for another's actions. For example, Suppose they do get pulled over for taking a joy ride? It's their funeral, or I don't care whether you quit your job? it's not my funeral. This hyperbolic term implies that an action is so bad it will result in death. [Slang; mid-1800s]
American Heritage Idioms