coffin
槥 centers on a container for the dead: a coffin. The meaning is narrow and concrete, with no clear abstract extensions.
槥 combines 木 (wood) with 彗, which likely contributes the sound. The character refers to a wooden coffin, but the exact historical development of 彗 in this context is uncertain.
The left side 木 suggests wood, and the right side 彗 looks like a broom sweeping away dust. Picture a wooden coffin being prepared for a final rest, as if sweeping away the remains of life.
For エイ, imagine the coffin of an ancient Egyptian (エイ) pharaoh, made of fine wood: Egypt -> エイ, and the wooden coffin holds the mummy.