Simplified form of 肅. Depicts a hand holding a bamboo stick (聿) walking on the edge of an abyss (𣶒). Based on the original meaning "to tremble with fear". The meaning later shifted to "solemn" and "pay respects".
Original meaning
to tremble with fear
Components
聿(iconic, remnant) — Used here to depict a hand holding a bamboo stick.
𣶒(iconic, simplified) — Depicts a deep pool filled with water.