grunting sound of pigs, clash
遰 is a rare kanji whose given meanings are disconnected: a grunting pig sound and a clash. There is no clear conceptual center linking them, so treat its meaning as uncertain and context-dependent.
遰 combines the movement radical 辶 with 帶, which likely contributes the sound. The exact historical development and how it acquired the meanings 'grunting sound of pigs' and 'clash' is uncertain.
The movement radical 辶 suggests something moving or traveling, while the inner 帶 looks like a belt or sash. Picture a pig wearing a sash that makes a grunting sound when it moves, or two sashes clashing as they are carried along.
For テイ, imagine a pig grunting 'tei' as it clashes with a gate while moving along a path: tei -> テイ.