stammer
hesitate;lose confidence
"there was a hesitation in his speech"
"Their enthusiasm is faltering"
"The drunk man stumbled about"
"The speaker faltered when he saw his opponent enter the room"
He felt his legs faulter.
出自: R. Wiseman
Like a newborn calf, the girl took a few aimless steps which faltered in embarrassment.
出自: I. McEwan