go through thick and thin 赴汤蹈火；出生入死；同甘共苦

【例句】
People accept a lot of pain if everybody's going through the chute together.
只要能做到同甘共苦,人们便能承受很大的痛苦.

Should be a true friend that you can go through thick and thin with a blind eye to the pros, and you can talk people.
真正的朋友应该是那种可以与你同甘共苦，不计较利害得失，可以和你谈心的人。