Most common in 抽屉 ('drawer'), where it is the toneless second syllable. It also acts as a measure word for tiers of a bamboo steamer, as in 一屉包子 ('one tray of buns').
The corpse radical wraps the top and left. Here it acts as a shape marker for a flat, slab-like object that slides, fitting for a drawer or steamer tray rather than meaning 'body'.
