Something that's clogged is blocked or stopped up. When your sink is clogged, the soapy water can't flow down the drain.

If your gutters are clogged with leaves, rain water will simply flow and drip over the edges, and if your arteries become clogged, you'll be at a higher risk for having a heart attack. In both cases, the clogged things need to be cleared or cleaned out in order to work properly. Another way something can be clogged is to be clotted or thickened: "I don't like this oatmeal because the pieces are all clogged together."

Definitions of clogged
  1. adjective
    stopped up; clogged up
    clogged pipes”
    clogged up freeways”
    synonyms: choked
    shut off to passage or view or hindered from action
  2. adjective
    thickened or coalesced in soft thick lumps (such as clogs or clots)
    “seeds clogged together”
    synonyms: clotted
    relatively dense in consistency
  3. adjective
    loaded with something that hinders motion
    “"The wings of birds were clogged with ice and snow"-Dryden”
    loaded to excess or impeded by a heavy load
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