I. mull 1 /mʌl/ BrE AmE verb [transitive]
[ Date: 1800-1900 ; Origin: mull 'to crush into powder' (15-20 centuries) , from mull 'dust' (14-19 centuries) , probably from Middle Dutch mol ]
usually mull something ↔over to think about a problem, plan etc for a long time before making a decision SYN consider :
He’s mulling over the proposals before making any changes.
The company is mulling over a share offer.
II. mull 2 BrE AmE noun [countable]
an area of land that sticks out into the sea – used in Scotland:
the Mull of Kintyre