This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The modern form visually contains 氵 (water) and 大 (big), but the original meaning and component relationship are unclear.
With water 氵 and big 大, you might imagine a big wave washing something away, but the real meaning is uncertain.
For タイ, imagine a big wave tying up a boat: tie -> タイ, though the meaning is unclear.