high mountain, lofty, eminent
崧 centers on towering height and prominence: a high mountain, something lofty, or a person of eminent standing.
崧 combines 山 (mountain) with 松, which likely contributes the sound and reinforces the idea of tallness through the image of a towering pine.
A mountain 山 with a pine tree 松 on top: the pine makes the mountain seem even higher and more eminent.
For シュウ, imagine a shoe resting on the lofty peak: shoe -> シュウ, and the mountain is so high it touches the shoe of a giant.