noun
Legal term for the crime of breach of trust, typically involving a person in a position of responsibility acting against the interests of the principal.
会社の取締役が背任罪で逮捕された。
The company director was arrested for breach of trust.
横領罪 is embezzlement, which involves misappropriating property, while 背任罪 is breach of trust, which involves acting against the interests of another without necessarily taking property.
Compound of 背任 (breach of duty) + 罪 (crime). The exact historical derivation is uncertain; the term is a modern legal coinage.