ruminate ruminate /ˈruːmɪˌneɪt/

verb

1. Reflect deeply on a subject  ( excogitate , mull over , ruminate , chew over , contemplate , meditate , mull , speculate , think over , muse , ponder , reflect )
   reflect deeply on a subject
    I mulled over the events of the afternoon
   I mulled over the events of the afternoon
    Philosophers have speculated on the question of God for thousands of years
   philosophers have speculated on the question of God for thousands of years
    The scientist must stop to observe and start to excogitate
   The scientist must stop to observe and start to excogitate
   
2. Chew the cuds  ( ruminate )
   chew the cuds
    Cows ruminate
   cows ruminate