The term 'chew over' is an idiom that means to think deeply and carefully about something. The crossword solutions for this term are CUD (3 letters), RUMINATE (8 letters), MULL (4 letters), MEDITATE (8 letters), and PONDER (6 letters). CUD is a type of food that cows chew on for a long time before swallowing. Ruminant animals, such as cows, are known for their ability to chew CUD and RUMINATE, which means to think deeply and reflect on something. MULL means to think deeply and carefully about something, while MEDITATE means to focus one's mind on a particular thought or activity. Lastly, PONDER means to consider something thoughtfully and at length. All of these words can be used to describe the action of thinking deeply and carefully about something, which is the definition of the term 'chew over'.