Meaning

• To reach a partly (or totally) unqualified conclusion.

• To solve by a correct conjecture; to conjecture rightly.

  "He who guesses the riddle shall have the ring."

• To suppose (introducing a proposition of uncertain plausibility).

  "That album is quite hard to find, but I guess you could try ordering it online."

• To think, conclude, or decide (without a connotation of uncertainty). Usually in first person: "I guess".

  ""I guess I'll go to bed.""

• To hit upon or reproduce by memory.