Lingo
[be] murder
(of a task) to be very difficult or almost impossible to do or complete
The idiom "be murder" is used to describe a task, situation, or experience that is extremely difficult, challenging, or unpleasant. The expression originated in the early 19th century and draws its metaphorical meaning from the act of committing murder, which is considered one of the most wicked and difficult acts to do.
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