The snake suddenly bit the herpetologist's right thumb in a single fast strike.

I bite my thumb at your fathers, if you know who they are!

She went into the library and glowered at the portrait for some minutes, biting her thumb.

She began to bite her thumb, at first slowly, then faster.

Nrrna glanced up at Kelly, who was biting her own thumb.

"For two months and a day," said the man, biting his thumb.

As if he knew what she was thinking, he smiled and bit her thumb.

She bit her thumb at the blond man.

He must have been biting his thumb the entire time not to say anything.

She tried to bite his thumb as he did so, but it made no appreciable impression on him.