'think over' definitions:

Definition of 'think over'

(from WordNet)
verb
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]

Synonyms of 'think over'

From: Moby Thesaurus