a vain person or show‑off; someone who likes to put on airs and display themselves to impress others.
彼は見栄っ張りで、高い時計を買って友達に見せびらかした。
He's a show‑off — he bought an expensive watch and flaunted it to his friends.
彼女は見栄っ張りだから、パーティーではいつも派手な服を着る。
She's a bit of a show‑off, so she always wears flashy clothes to parties.
子どもの前で父が見栄っ張りなところを見せるのは少し恥ずかしい。
It's a little embarrassing when my father shows off in front of the kids.