Does Sahabat Javanology know the meaning of this proverb? The proverb Ngajari Bebek Nglangi means pegawean sing ora ana paedahe or in English means work that has no benefits. In other words, although we have tried our best without providing any benefit or ending in vain. For example, if we advise people who are already smart, maybe we will not be heard and in the end it will end in vain, like teaching a duck to swim, even though the duck is already good at swimming.