1. think deeply about something
Professional
Social
mull something over
To 'mull over' something means to consider it or think about it deeply in a significant way. When you 'mull over' something it means the decision is quite serious and you need time to think about it. You can say 'let me mull it over for a while,' if someone is pressuring you for an answer and you need more time. Similar in meaning to 'ponder it' and 'weigh up the pros and cons'.