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be spoiling for (something)
To be particularly eager or enthusiastic for something. Used especially in the phrase "be spoiling for a fight. Come on, don't engage with that drunken fool, he's spoiling for a fight!
Be eager for, as in He's just spoiling for a fight. This idiom nearly always refers to some kind of altercation. It may allude to spoil in the sense of "deteriorate over a period of time." [Mid-1800s]
To be eager for something, especially a fight: The drunk soccer players at the bar were spoiling for a fight.