The word "屹立" is formed by combining the character "屹", which uses the mountain radical (山) to imply loftiness and the component "乞" primarily for phonetic indication, with the character "立", a pictogram representing a person standing. Together, they create a compound where "屹" intensifies the notion of height in "立", resulting in a term that means to stand tall or tower, often describing something like a mountain or a steadfast structure.