To flatter or fawn over someone; to curry favour by being obsequious or ingratiating.
彼は上司にへつらってばかりいる。
He is always sucking up to his boss.
政治家が有権者にへつらう姿は好ましくない。
It's undesirable for politicians to pander to voters.
へつらって得た信用は長続きしない。
The favour gained by flattering doesn't last long.