top dog (topdogs)

• 1.  

  N-COUNT（可数名词） If a person or organization is top dog, they are the most successful or powerful one in a particular group. 领军人物 [非正式]

  例：

  Reynolds has never concealed his ambition to be the top dog.

  雷纳尔德从不掩饰他要成为领军人物的雄心。