His sister was afraid, but he told her to muster up courage.
"Let me reckon," said the host, beginning to muster up his arithmetic.
She was told that he was; and she felt that she had to muster up all her courage to encounter him.
But he never could muster up courage enough to put the question.
"You certainly have more courage than I could muster up," I said.
I'll muster up all the tailors in the town, and so tickle their sides.
A man acknowledges punctuality to be right and desirable, but cannot muster up sufficient energy and resolution.
He had found himself on a small island, and could not muster up courage to plunge into the cold water again in the darkness.
I lay as I was, and had but one thought that the sun must kill me here, but still I could not muster up the courage to go away.
He vowed he would get square, but during Nat's stay at the farm he could not muster up courage to do so.