falter
verb
1 when war seemed imminent the government faltered:
hesitate, delay, drag one's feet, stall, think twice, get cold feet, change one's mind, waver, oscillate, fluctuate, vacillate, be undecided, be indecisive, be irresolute, see-saw, yo-yo;
British haver, hum and haw;
informal sit on the fence, dilly-dally, shilly-shally, pussyfoot around, blow hot and cold;
rare tergiversate.