noun which may take the genitive case particle 'no', noun
outside one's field; out of one's line
Used when something is not within one's area of expertise or specialty. Often appears in phrases like 畑違いの仕事 (work outside one's field).
He took on a job outside his field.
I'm sorry for asking a question that's out of my line.
noun which may take the genitive case particle 'no', noun
(sibling) from a different mother
Rare, somewhat old-fashioned expression for a half-sibling with a different mother. More commonly expressed as 異母兄弟 (いぼきょうだい) or 腹違い (はらちがい).
He has a half-brother from a different mother.