牛後 ぎゅうご
gyūgo

Noun

1. rump of a cow

鶏口 けいこうとなるも牛後 ぎゅうごとなるなかれ。
kēkōto narumo gyūgoto naru nakare.
Better be the head of a dog than the tail of a lion.
Noun

2. low-ranking member of a large group