He chewed upon the inside of his cheek.

He sat, now, all day in the sun, his gums working constantly as though he chewed upon something.

The Lord Chancellor looked as if he were chewing upon something bitter.

Trembling, chewing upon her lower lip, she did so.

He chewed upon his knuckles, he felt wrong inside.

Rex chewed upon his lip and tried to sober up.

He found some cheese and began to chew upon it.

Pooley chewed upon the Professor's words that might have been a compliment.

He chewed upon his reed pen for a moment, then tossed the thing down.

Her eyes narrowed and she chewed upon her lower lip as if troubled.