From Longman Dictionary of Contemporary Englishmullmull1 /mʌl/ verb [transitive]usually mull something ↔ over to think about a problem, plan etc for a long time before making a decision syn considerHe’s mulling over the proposals before making any changes.The company is mulling over a share offer.→ See Verb table
mullmull2 noun [countable]SGDNan area of land that sticks out into the sea – used in Scotlandthe Mull of Kintyre
Examples from the Corpus
mull• We have wine on the mull.MullMull (also the Isle of Mull)a large island off the westcoast of Scotland, the largest island in the Inner Hebrides. It is often visited by tourists, especially in summer.