Толковый словарь английского языка Oxford English Reference - might

1. past of MAY, used esp.: 1 in reported speech, expressing possibility (said he might come) or permission (asked if I might leave) (cf. MAY 1, 2). 2 (foll. by perfect infin.) expressing a possibility based on a condition not fulfilled (if you'd looked you might have found it; but for the radio we might not have known). 3 (foll. by present infin. or perfect infin.) expressing complaint that an obligation or expectation is not or has not been fulfilled (he might offer to help; they might have asked; you might have known they wouldn't come). 4 expressing a request (you might call in at the butcher's). 5 colloq. a = MAY 1 (it might be true). b (in tentative questions) = MAY 2 (might I have the pleasure of this dance?). c = MAY 4 (who might you be?). Phrases and idioms might as well expressing that it is probably at least as desirable to do a thing as not to do it (finished the work and decided they might as well go to lunch; won't win but might as well try). might-have-been colloq. 1 a past possibility that no longer applies. 2 a person who could have been more eminent. 2. n. 1 great bodily or mental strength. 2 power to enforce one's will (usu. in contrast with right). Phrases and idioms with all one's might to the utmost of one's power. with might and main see MAIN(1). Etymology: OE miht, mieht f. Gmc, rel. to MAY(1)