think think about contemplate consider give thought to give consideration to mull over meditate meditate on muse muse on ponder ponder on ponder over reflect reflect on deliberate deliberate about deliberate on ruminate ruminate about ruminate on ruminate over dwell on brood brood on brood over agonize agonize over worry worry about chew over puzzle puzzle over speculate about weigh up revolve turn over in one's mind review study be in a brown study