Synonyms and related words :
balbuties, be guilty, blush, change color, color, color up, crimson, dysphemia, falter, faltering, flush, gibber, halt, hammer, haw, hem, hem and haw, hesitate, hesitation, hum, hum and haw, jabber, look guilty, lurch, mammer, mantle, palilalia, pause, redden, splutter, sputter, squirm with self-consciousness, stagger, stammering, stumble, stutter, stuttering, topple, totter, traulism, turn red, wobble