top dog
US /tɑp dɔɡ/
UK /tɑp dɔɡ/

1.
掌权者, 领导者, 老大
the most important or powerful person in a group or organization
:
•
After years of hard work, he finally became the top dog at the company.
经过多年的努力,他终于成为了公司的掌权者。
•
Everyone wants to be the top dog, but few have what it takes.
每个人都想成为领导者,但很少有人具备这个能力。