sleeve, foot (of hill), edge
袂 centers on a sleeve, especially the part that hangs down. The extended meanings of a foot of a hill or an edge come from the image of a sleeve-like hanging or projecting part.
袂 combines the clothing radical 衤 with the phonetic component 夬, which likely contributed the sound. The character originally referred to a sleeve.
The clothing radical 衤 on the left hints at fabric, and the right side 夬 looks like a hand reaching out of a sleeve. Picture a long, flowing sleeve hanging down from a robe.
For ベイ, imagine a sleeve so long it drags on the ground like a bay leaf trailing behind: bay -> ベイ, and the sleeve sweeps the floor.
sleeve (esp. of a kimono); pocket of sleeve
parting (from someone)
tears on the sleeves (of one's kimono); weeping copiously
to part (from); to part company (with); to split (with); to break off relations (with)
to shed many tears; to weep; to wring dry one's sleeve (which has been soaked by tears)
to do in unison; to do en masse
dust, etc. that gathers in the bottoms of sleeves (esp. in Japanese traditional clothing)
doing in unison; doing together; doing en masse