brood over (?.)

• ache
• agonize
• bear in mind
• bleed
• breathe vengeance
• cherish
• chew over
• con over
• deliberate over
• deliberate upon
• digest
• dwell on
• dwell upon
• fan the embers
• fret
• grieve
• harbor revenge
• have in mind
• hold in mind
• keep
• keep in memory
• keep in mind
• keep in view
• meditate upon
• mope
• mourn
• mull over
• muse on
• muse over
• pine
• pine away
• ponder over
• reflect over
• retain
• revolve
• ruminate over
• run over
• sorrow
• take on
• think over
• treasure
• turn over