1. 
[syn: chew over, think over, meditate, ponder, excogitate, contemplate, muse, reflect, mull, mull over, ruminate, speculate]
WordNet (r) 3.0 (2006):
chew over
    v 1: reflect deeply on a subject; "I mulled over the events of
         the afternoon"; "philosophers have speculated on the
         question of God for thousands of years"; "The scientist
         must stop to observe and start to excogitate" [syn: chew
         over, think over, meditate, ponder, excogitate,
         contemplate, muse, reflect, mull, mull over,
         ruminate, speculate]