noun
bossy manner; acting like a boss
Describes someone who behaves in a bossy, overbearing way, as if they were the head of a group. Often used critically.
彼はいつも親分風を吹かせて、みんなに命令する。
He always acts bossy and orders everyone around.
新入りのくせに親分風を吹かせる
Don't act like you're the boss when you're just a newcomer.
威張る is a verb meaning 'to be arrogant' or 'to throw one's weight around'. 親分風 is a noun describing the bossy manner, often used with 吹かせる.
Compound of 親分 (boss, leader) and 風 (style, manner). Literally 'boss-like manner'.