Covered with wounds — having injuries all over one's body. A four-character idiom indicating severe physical injury.
戦場から戻った彼は満身創痍の状態だった。
He returned from the battlefield badly wounded all over.
事故の被害者は満身創痍で病院に運ばれた。
The accident victim, covered with injuries, was taken to the hospital.
Figuratively, to be battered or mauled — subjected to attacks or criticisms from many sides and left in a ruined state.
新製品は不具合続きで、発売後すぐに満身創痍の評判になった。
The new product suffered so many problems that it was immediately heavily criticized after release.
彼のチームは連敗で満身創痍の状態だが、諦めてはいない。
His team is battered from a series of losses, but they haven't given up.