offer sacrifice, sacrifice
禋 centers on the act of offering a sacrifice, especially in a ritual or religious context. The given meanings both point to presenting something as an offering.
禋 combines 示 (altar, religious ceremony) with 垔, which likely contributes the sound. The character is associated with ritual offerings.
The left side 示 (礻) is an altar. The right side 垔 looks like a container being placed on the altar. Picture a ritual vessel being offered as a sacrifice.
For イン, imagine an innkeeper offering a sacrifice at the altar: inn -> イン, and the offering is placed on the 示 altar.