Clogged means blocked so that nothing can pass. A clogged drain, clogged pores, clogged with leaves.
It implies gradual accumulation rather than a single obstruction, which is why drains, filters, arteries and roads are described this way. A clogged filter still passes something, badly. Note clog, the wooden shoe, which is the same word — a clog was originally a block of wood.
1adjectivecloggedBlocked so that nothing can pass.
“The kitchen sink was clogged with grease and food scraps.”
clogged is a quality of blockage.
Proto-Germanic
*klumpô — lump, mass, clasp
Middle English
clog — weight attached to the leg of an animal to impede movement
English
clog
English, today
clogged
clog unknown; perhaps from Middle English clog (“weight attached to the leg of an animal to impede movement”). Perhaps of gmq - origin and derived from Proto-Germanic klumpô (“lump, mass, clasp”); compare Old Norse klugu, klogo (“knotty tree log”), klomp.
Etymology from Wiktionary, CC BY-SA