To utter what one is thinking. / (idiomatic) To voice one's ideas; to brainstorm.

I believe that is the case, but am not certain.

(idiomatic) Thinking that is not grounded or in touch with the realities of the present; open-minded thinking.

used after a statement to indicate an emphatic or ironic negative

(slang) Synonym of think with one's little head

plural of think-pair-share

(education) The act of using the think-pair-share strategy.

(education) A collaborative teaching strategy in which the teacher poses a question or a problem to the students, and the students are given sufficient time to think and gather their thoughts, after which the teacher asks them to pair themselves and share their thoughts with each other.

To reflect on and reframe an event; to reconsider.

A data-gathering method used in a variety of research areas in people are asked to verbalise their thought processes as they do a specific task, and this is recorded for further analysis.