paste, glue, sizing
糊 centers on sticky substances used to bond or coat: paste, glue, and sizing (a stiffening agent for fabric or paper).
糊 combines 米 (rice) with 胡, which likely contributes the sound. Rice paste has long been used as a glue or sizing agent in East Asia.
Rice 米 is cooked into a sticky paste, and the right side 胡 looks like a container holding the glue. Together they make 糊, a sticky paste or sizing.
For コ, imagine a child saying 'co-co' while playing with sticky rice paste: co -> コ, and the paste sticks to everything.
paste; glue
clotted blood; gore; sticky clots of blood
starching (e.g. clothes)
patching up (e.g. a failure); covering up (e.g. a mistake); glossing over
starch glue; starch paste
warabinori (glue produced from bracken starch)
mucilage
glue stick
spray glue; spray adhesive
glue tape; double-sided adhesive tape dispensed from a roller
dye resistant starch (used to protect a design)
to eke out a living; to barely manage to get by
aged paste; microbially fermented weak adhesive for restoration of Japanese works of art on paper
rice starch; rice paste
obscure; vague; ambiguous
dim; vague; indistinct; faint; obscure
laundry starch
to paste; to stick on with glue; to starch (e.g. a shirt)
well-starched (clothing); stiffly starched
adhesive tape; sticky tape