mix it up

US /mɪks ɪt ʌp/

UK /mɪks ɪt ʌp/

to fight or argue with someone

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He's always ready to mix it up with anyone who challenges him.

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The two teams started to mix it up on the field after a foul.

to vary or change things to make them more interesting or effective

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You should mix it up a bit in your workout routine to avoid boredom.

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The director decided to mix it up by casting an unknown actor in the lead role.