alpha male        
noun [ C usually singular ] uk/ˌæl.fə ˈmeɪl/ us/ˌæl.fə ˈmeɪl/
 biology specialized(在群体中)居统治地位的雄性 
the most successful and powerful male in any group
  爱支配他人、成功而坚定的男人;大男子主义者
a strong and successful man who likes to be in charge of others