起死回生 = recovering from a hopeless situation
起 = to get up
死 = death
回 = revolve
生 = life
One of the first calligraphy works I posted online, I like the message of hope in this idiom.
This is a special kind of Japaneses idiom known as a 四字熟語 (よじじゅくご、yo-ji-juku-go), or 4-character idiom. As the name suggests, these are idiomatic phrases made of 4 kanji.
They often contain a small life lesson or moral message, similar to English sayings such as “you reap what you sow” and “the early bird gets the worm”.