JMdict: 1632610

べし 【べし】

1. [aux] must; should; ought to
2. [aux] will (surely); be bound to; must
3. [aux] will (do); shall

Words often seen with this one: (experimental feature)

者 (15), という (12), 人 (12), 死 (12), 眠り (12), ぐる (10)