Honorific (sonkeigo) form meaning 'to eat' or 'to drink,' used to show respect toward someone (e.g., guests or superiors).
お茶を召し上がりますか？
Would you like some tea?
どうぞご遠慮なくお召し上がりください。
Please help yourself without hesitation.
もう召し上がりましたか。味はいかがでしたか。
Have you already eaten/drunk it? How was the taste?