An important or eminent person; someone with high status or authority, often used colloquially for bosses, dignitaries, or bigwigs.
明日、偉い人が会社に来るので挨拶の練習をした。
Since an important person is coming to the company tomorrow, we practiced greetings.
偉い人の前ではみんな緊張している。
Everyone is nervous in front of the VIP.
彼は若くして偉い人になった。
He became an important person at a young age.