There is, of course, no hard line of separation for these two streams.
Sam's jaw snapped together, and his mouth became a hard line.
His lips were thin and pallid, making a hard line of his mouth.
But the girl made no reply, and her beautiful mouth took on a hard line.
He was pale, and his lips were drawn in a hard line, as if the frost had stiffened them.
He had divided with a hard line his life at school and his life at home.
Her face was pinched, her mouth set in a straight, hard line.
He was rather pale now, and there was a hard line round his mouth.
“Melons,” the woman repeated, and the hard line of her mouth relaxed.
Only from them, she could reconstruct every hard line of the hidden face.