piled high
堆 centers on accumulation into a mound or heap: things piled high, stacked up, or gathered into a raised mass.
堆 combines 土 (earth, soil) with 隹, which likely contributes the sound. The compound suggests earth piled up into a mound or heap.
The left side is 土 (earth), and the right side 隹 looks like a bird. Imagine a bird piling up earth with its beak, creating a high mound.
For タイ, picture a tie (necktie) draped over a high pile of earth: tie -> タイ, and the pile is piled high.
accumulation; pile; heap
compost; manure
bank (elevation in the seabed)
medial moraine
lateral moraine
lateral moraine
piled up high; in a heap
red lacquerware with patterns carved in relief
(terminal) moraine
sedimentation
sedimentology
sedimentary layer
sedimentary rock
sediment; deposit
cycle of sedimentation
composting
Ryūkyūan lacquerware technique (using a pigmented lacquer design pasted onto the lacquered surface)
fully matured compost
ground moraine
moraine