noun, noun or participle which takes 'suru', intransitive verb
acting like a senior; patronizing attitude
Describes someone who acts superior or condescending based on seniority, often used critically. Can be used as a noun or with する to describe the behavior.
彼は入社したばかりなのに、すぐ先輩面をする。
Even though he just joined the company, he immediately acts like a senior.
先輩面した態
A patronizing attitude can sometimes make you disliked.