top dog

Từ điển Việt Anh Việt 4in1 - English Vietnamese 4 in 1 Dictionary

ˌtop ˈdog BrE AmE noun [countable]
the person who has the most power in a group, especially after a struggle:
He always wanted to be the one in control, the top dog.

top+doghu

◎	[top dog]
〆	saying & slang
	■	boss, leader, head honcho
		☆	Kruger is top dog now, but he could lose the next election.