eat, breathe, and sleep

beauty sleep

Originally, sleep taken before midnight, on the belief that early sleep hours conduce to beauty and health; now (chiefly humorous), sleep at any time needed by one to stay beautiful; (countable) an instance of such sleep.

big sleep

Death.

bite to eat

A snack or quick meal.

breathe a sigh of relief

to be relieved; to feel relief.

breathe a word

To divulge even part of a secret (usually used with a negative).

breathe down someone's neck

To follow or supervise someone too closely, causing discomfort for that person.

breathe easy

To relax or feel secure about something.

breathe one's last

To die.