behave vs fall over backwards

Other hyponyms of behave include act involuntarily, act reflexively, bend over backwards, presume, vulgarise, vulgarize, optimise, optimize, quack, menace, make, bluster, swagger, swash, freeze, wanton, romanticize, sentimentalise, sentimentalize, sentimentise, sentimentize, bungle, play, toy, act, act as, play, stooge, jest, joke, piffle, make, make as if, break down, lose it, snap, fluster, dally, dawdle, assert, put forward, backslap, deal, hugger mugger, walk around, sauce, pose, posture, footle, frivol, trifle, puff up, swell, follow, loosen up, relax, rage, ramp, storm, wildin', spaz, thug.