intransitive. To adduce arguments, argue, reason.

To think in a connected or logical manner; to employ the faculty of reason in forming conclusions. intransitive. With from (a premise or datum); about…

intransitive. To employ reasoning or logic; to reason. Cf. discourse, n. 1. Now rare.

intransitive. To reason; to carry out or form judgements by a process of logical reasoning. Occasionally transitive (reflexive).

intransitive. To reason; to ratiocinate. Occasionally transitive.

intransitive. To use logical argument, employ logic.

In a straight course or line. to think straight: to think clearly or logically. colloquial.