This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 芖 is uncertain. It visually contains 艹 (grass) above 大 (big), but the original meaning and component relationship are unclear.
With no clear meaning, picture a big 大 patch of grass 艹: something large and grassy, but its true sense is unknown.
For チ, imagine a big 大 patch of grass 艹 that needs a trim with a tiny pair of shears: the trim sound cues チ.