dregs, sediment, grounds
糟 centers on the leftover solid bits that settle out of a liquid or processed grain: dregs, sediment, or grounds. It is the waste or residue left behind after the useful part is removed.
糟 combines 米 (rice) with 曹, which likely contributes the sound and may relate to the idea of leftover material from grain processing.
Rice 米 is processed, and the right side 曹 looks like a container with a lid. Picture the leftover dregs and sediment collecting at the bottom of a rice-wine vat.
For コウ, imagine a cook pouring off the clear liquid and leaving the dregs behind: cook -> コウ, and the cook discards the sediment.
to be scolded (mainly used theatrically)
roan (type of horse colour (color))
soup made with sake lees
sake lees
chaff and bran; plain food
one's devoted wife; wife who has followed one through hard times; wife married in poverty
vinegar made from sake lees
Japanese angel shark (Squatina japonica)