Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: mull 'to crush into powder' (15-20 centuries), from mull 'dust' (14-19 centuries), probably from Middle Dutch mol

mull

1 verb
     
mull1 [transitive]
usually mull something ↔over to think about a problem, plan etc for a long time before making a decision:
He's mulling over the proposals before making any changes.
The company is mulling over a share offer.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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