to show off; to flaunt
彼は自分の成功を見せびらかすのが好きだ。
He likes to show off his success.
彼は新しい車を近所に見せびらかした。
He showed off his new car to the neighbors.
彼女は高級バッグを周りに見せびらかしている。
She is flaunting her luxury bag in front of everyone.