stallion, promote
騭 centers on a stallion, a male horse kept for breeding, and by extension the idea of promoting or elevating something of superior quality.
騭 combines 馬 (horse) with 陟, which likely contributes the sound and the idea of ascending or promoting. The exact historical development is uncertain.
The bottom 馬 is a horse, and the top 陟 looks like a step or ladder. Picture a stallion being promoted to lead the herd, stepping up above the others.
For シツ, imagine a stallion being promoted in a prestigious show: the show's name is 'Shitsu' (シーツ), and the stallion wins the top prize.