a local bully or tyrant who uses their power or connections to oppress others in a specific area; a regional mafia boss

Literally "even a powerful dragon cannot repress a snake in its own haunts"; used to mean that a powerful person from the outside cannot compete with local forces who have the advantage of being on their own home turf

A local thug or bully who causes trouble for their own community, especially one who colludes with outsiders.

The top and bottom margins of a printed page, formed by combining the [[天头|天頭|tian1 tou2]] and the [[地头|地頭|di4 tou2]].

even powerful outsiders cannot compete with local thugs or influential residents; literally, a powerful dragon cannot defeat a local snake