accept a responsibility, undertake, take on

引き受ける: to accept the responsibility, to undertake, to take on.

child

(formal) Female third-person singular pronoun; she, her, girlfriend

(colloquial) a girlfriend (a female partner in a romantic relationship)

(literary) they (about women or girls)

child's naive mind, child's juvenile mind

plural of 子供: children

(literary) they (about women or girls)

(offensive, Internet slang) a man whose age is greater than about thirty or forty who lives in one's child room and with one's parent(s).