1. verb /θɪŋk/
a) to ponder, to go over in ones head
Idly, the detective thought what his next move should be.
b) To communicate to oneself in ones mind, to try to find a solution to a problem.
I thought for three hours about the problem and still couldn’t find the solution.
Syn: cogitate, ponder, reflect, ruminate, opine, guess, imagine, reckon, suppose, consider, deem, find, judge, regard
2. noun /θɪŋk/
An act of thinking; consideration (of something).
Ill have a think about that and let you know.
Wikipedia foundation.