Might1  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). 3 (foll. By present infin. Or perfect infin.) Expressing complaint that an obligation or expectation is not or has not been fulfilled (they might have asked). 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 1 d (who might you be?).  might as well expressing lukewarm acquiescence (might as well try).