The phrase "on high" is often used to describe something that is positioned above or elevated from its surroundings. There are many synonyms that can be used to convey the same meaning, such as "up high," "aloft," "in the air," "above," "overhead," "elevated," "upward," "atop," "topmost," "skyward," and "at a height." Each of these synonyms carries a slightly different connotation, but they all refer to something that is situated above the ground or standing out from its surroundings. So, if you need to describe something that is elevated or positioned at a height, you have plenty of synonyms to choose from!