chew at one's lip

She nodded, and chewed at her lip, wondering what was coming next.

Heather chewed at her lower lip, waiting for what he'd say or do.

He pulled it away and chewed nervously at his lower lip.

Wolf was thoughtful for a moment, chewing at his lip.

Kira chewed at her lower lip, but she could think of only one thing to say.

The Duke chewed at his lower lip and said nothing.

She chewed at her lower lip as sfr read that section over again.

He flinched and stopped to chew at his lip before going on.

"Neither," the big man replied, nervously chewing at his lower lip.

The Celt chewed at his lower lip; he lived with that fear, too.