Mull over is a phrase that means to think deeply and carefully about something. The crossword solutions for this term include CHEW, PORE, CONSIDER, CONTEMPLATE, WEIGH, STEW, chewon, PONDER, REFLECT, COGITATE, and RUMINATE. All of these words suggest taking the time to think deeply and carefully about something, whether it be by chewing on it, poring over it, considering it, contemplating it, weighing it, stewing on it, pondering it, reflecting on it, cogitating on it, or ruminating on it.