expression, suru verb (irregular)
share joys and sorrows; stick together through thick and thin
Idiomatic phrase used for close relationships where people experience both good and bad times together.
彼とは長年苦楽を共にしてきた親友だ。
He is a close friend with whom I have shared joys and sorrows for many years.
夫婦は苦楽を共
A married couple should share the good and the bad together.