knock heads
idiom
US, informal
1
: to argue or disagree
The two of them knocked heads soon after they started working together.
2
: to use angry or forceful methods to control or punish people
I am going in there and knock some heads if they don't start behaving.
—often + togetherI am going to go in there and knock their heads together if they don't start behaving.
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Merriam-Webster unabridged
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