「下」(shita) means "down," "below," or "bottom." It indicates a lower position, the opposite of "上." For example, if something is under the table, you would say, "テーブルの下に" (teeburu no shita ni), meaning "under the table."

「下」(した)は「〜より低い所」という意味です。位置を示します。例：「机の下。」