covered in blood; bloodstained — used to describe a person or object smeared or soaked with blood.
彼は事故で服が血まみれになった。
His clothes were covered in blood from the accident.
犯人は血まみれで逃げたと目撃者が言った。
Witnesses said the perpetrator ran away covered in blood.
ホラー映画のラストは血まみれのシーンが多い。
The horror movie's finale has many bloody scenes.