head on a platter(someone's) head on a plate/platter
if you want someone's head on a plate you are very angry with them and want them to be punished.
The director was furious at what had happened and wanted Watt's head on a platter.
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(one's) head on a plate/platter
A phrase used hyperbolically to refer to a very harsh punishment. If I find out that Paul was the one who sabotaged my presentation to the board, I'll have his head on a plate!Identify the vandals, and bring me their heads on a platter!