libation
餟 centers on the ritual act of pouring a liquid offering, a libation, often in a ceremonial or religious context.
餟 combines the food radical 飠 with the phonetic component 叕, which likely contributes the sound and may relate to joining or connecting, but the exact historical development is uncertain.
The food radical 飠 suggests an offering, and the right side 叕 looks like a hand pouring from a vessel. Imagine a ceremonial feast where liquid is poured out as a libation.
For テツ, picture a priest pouring a libation while wearing a tetsubo (a metal staff) on his back: tetsu -> テツ, and the ritual offering is made.