The list of dinner guests I'll mull over who should sit with
who.
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As in "to mull something over"? Think, contemplate, consider,
cogitate, examine...
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The word mull is a verb. It means to work or think something
over.
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ponder, wonder, mull-over, decide
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The phrase, 'mull over' came from the process by which apple
cider is made. The mulling was the cooking of the liquid from the
apples after adding spices. This sometimes took several hours to
complete.