expression, godan verb (-su)
act superior as a senior; pull rank; put on a patronizing air
Used when a senior (先輩) acts condescendingly or flaunts their experience toward juniors. Often carries a negative nuance.
See also: 風を吹かす
彼は入社したばかりの後輩に先輩風を吹かしている。
He's acting all superior to the new junior colleague.
先輩風を吹かすのはやめて、普通に話してほしい。
Stop pulling rank and just talk to me normally.