edge forward, trample
躙 centers on moving forward with heavy, crushing steps: edging forward slowly and deliberately, or trampling underfoot.
躙 combines 足 (foot) with 閵, which likely contributes the sound and may relate to pressing or advancing. The exact historical development is uncertain.
The foot radical 足 on the left suggests stepping. The right side 閵 looks like a gate 門 with a bird 隹 inside, as if a heavy foot is slowly edging forward to trample something under the gate.
For リン, imagine a heavy foot edging forward and trampling a ringing bell: the ringing sound cues リン while the foot crushes it.