She'd sit by the phone and chew her nails, waiting for him to call.

I noticed that she had been chewing her nails again.

You're a little old to still be chewing your nails, Carol, she thought.

You've been ready to chew your nails for over a week.

I chewed my nails to the elbows in those nine weeks.

I only have another half hour or so to chew my figurative nails.

You chew your nails down to the nub for her.

I was mad enough to chew nails, and iron ones at that!

I start chewing my nails although I haven't done that for a long time.

Another five minutes, and Sam began chewing her nails.