The word 罪行 is formed by conceptually combining two ideas: 罪 (zuì), which represents the abstract notion of guilt, wrongdoing, or sin, and 行 (xíng), which signifies a concrete action, deed, or conduct. Together, they create a single concept where the second character (行) acts as the tangible manifestation or embodiment of the first (罪), effectively meaning "the guilty deed" or "the criminal act", thus fusing the state of being culpable with the specific action that constitutes it.