The word "仰天" is formed by combining the character "仰", which means to look upward or admire and is itself composed of the person radical "亻" and the component "卬" indicating elevation, with the character "天", meaning sky or heaven. This combination results in a literal meaning of "to look up at the sky", where "仰" conveys the action of raising one's head upward and "天" specifies the object of that gaze.