mixed, abundant, assorted
遝 centers on things being mixed together in a jumbled, abundant, or assorted way. The idea is a disorderly collection or a mingling of many items.
遝 combines the movement radical 辶 with 眔, which likely contributes both sound and the idea of mixing or abundance. The exact historical development is uncertain.
The movement radical 辶 suggests things coming and going, while the inner 眔 looks like a crowded net or a jumble of items. Picture a busy marketplace where assorted goods are mixed together in abundance.
For トウ, imagine a toe getting mixed up in a tangled net: toe -> トウ, and the jumbled mess matches the kanji's meaning of mixed and assorted.