v.tr.1. To criticize or correct after an outcome is known: "One hesitates to second-guess the jury's judgment from a distance of more than sixty years" (Ira Stoll).
2. To criticize, contradict, or overrule (a decision or one who has made a decision): "When he wants to prescribe costly but powerful medicines, faraway HMO clerks second-guess his drug choices" (George Anders)."Sometimes [General Halleck] second-guessed Grant and aired his objections to instructions instead of immediately transmitting them" (Brooks D. Simpson).
3. a. To outguess.
b. To predict or anticipate: "She can second-guess indictments" (Scott Turow).