His lips betrayed him, though he tried to curb them.

But his eyes and his lips betrayed him.

Her lips and her eyes betray more than a hint of a smile: a sign of recognition, perhaps.

His face was pointed; his grinning lips betrayed a slight twitch.

He had fine regular features but his thin lips betrayed a vicious sensuality.

His sunken eyes, pursed lips, and trembling hands betrayed his misery.

The guards know we speak, but they do not care so long as our lips do not betray us.

Maxim's face was calm and intent; only the lip held under his teeth betrayed how tense he was.

His lips betrayed a hint of amusement.

While her arms continued to apply a token pressure against his chest, her lips betrayed her.