1.  theorize(v = verb.cognition) conjecture, hypothecate, hypothesise, hypothesize, speculate, suppose, theorise - to believe especially on uncertain or tentative grounds; "Scientists supposed that large dinosaurs lived in swamps"
is one way to anticipate, expect
Derived forms noun theorizer₁, noun theory₂, noun theory₃
Sample sentences: They theorize that there was a traffic accident

2.  theorize(v = verb.cognition) - construct a theory about; "Galileo theorized the motion of the stars"
is one way to reason
Derived form noun theorization₁
Sample sentences: Somebody ----s something

3.  theorize(v = verb.cognition) - form or construct theories; "he thinks and theorizes all day"
is one way to reason
Derived form noun theorization₁
Sample sentences: Somebody ----s

   To form a theory or theories; to form opinions solely by theory; to speculate. [1913 Webster]

theorize, v.intr. (also -ise) evolve or indulge in theories.

Derivative:
theorizer n.

VB  attribute to, ascribe to, impute to, refer to, lay to, point to, trace to, bring home to, put down to, set down to, blame, charge on, ground on, invest with, assign as cause, lay at, the door of, father upon, account for, derive from, point out the reason, theorize, tell how it comes, put the saddle on the right horse.

VB  suppose, conjecture, surmise, suspect, guess, divine, theorize, presume, presurmise, presuppose, assume, fancy, wis, take it, give a guess, speculate, believe, dare say, take it into one's head, take for granted, imagine, put forth, propound, propose, start, put a case, submit, move, make a motion, hazard out, throw out a suggestion, put forward a suggestion, put forward conjecture, allude to, suggest, hint, put it into one's head, suggest itself, run in the head, marvel if, wonder if, wonder whether.