also: きせきにはいる
expression, godan verb (-ru)
Idiomatic and somewhat literary euphemism for dying, literally 'to enter the death register'. Used in formal or solemn contexts.
祖父は昨年、静かに鬼籍に入りました。
My grandfather quietly passed away last year.
多くの著名人が今年鬼籍に入った。
Many notable people have passed away this year.