Hi teachers, I have found some useful idioms, but the dictionary says they are limited to British English. I wonder if American has their own expression similar to the British Idioms:
The kiss of life: to help someone who has stopped breathing to breathe again by blowing into their mouth and pressing their chest.
Kill or cure: a way of solving a problem which will either fail completely or be very successful.
not know you 're born: not realize how easy your life or situation is compared to other people's