top-dog

基本解释

Molly is top dog -- and cat -- when it comes to Britons' favourite name for their pet.
英国人最爱用“莫莉”给自己的宠物猫和宠物狗起名。
www.chinadaily.com.cn
The effect of the loss of top-dog status on the well-being of the average American is unlikely to be trivial.
失去领头羊地位对于美国人平均福利的影响绝对不容小视。
If you want to get back on top and cement the USA's position as being the top-dog , you wanted a little bit of a test.
如果你想要回到巅峰，巩固美国队世界领头羊的位置，你必须得接受一些考验。

Another possibility is Apple, current top-dog in the small but rapidly growing market for legal music downloads with its iTunes software.
ECONOMIST: Microsoft
For openers, he's the chairman and chief executive--top dog--and majority owner of the company, Track Data (nasdaq: TRAC - news - people ), in whose stock he purportedly trafficked.
FORBES: Tracking Track Data
Clicking on the top right will dog-ear the page for a bookmark.
ENGADGET: Kobo Glo review: another illuminated e-reader lights up the market

If a person or organization is top dog, they are the most successful or powerful one in a particular group.