cerebrate

How to sign: use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments
"I've been thinking all day and getting nowhere";

See also: muse, think over, think out, meditate, think up, mull, ponder, mull over, dream up, chew over, excogitate, ruminate, hatch, reflect, speculate, concoct, contemplate, think of

Similiar / Same: cogitate, think

Within this category: associate, brainstorm, chew over, concentrate, give, judge, philosophize, plan, puzzle over, rationalize, reason, reason, study, think, think, think, think about