might as well

(idiomatic) Used to express somewhat reluctant assent, saying that if one situation exists (or because it does exist), another event or situation that would otherwise be undesirable, difficult, impossible, etc., becomes more feasible or reasonable, or would not make a difference.
(idiomatic) Used to liken one situation to another, typically saying that the existence of one situation is equivalent to the existence of another, usually more extreme, situation.
Used other than figuratively or idiomatically: see might, as well.