The Collaborative International Dictionary of English v.0.48:

Clog \Clog\ (kl[o^]g), n. [OE. clogge clog, Scot. clag, n., a
   clot, v., to to obstruct, cover with mud or anything
   adhesive; prob. of the same origin as E. clay.]
   1. That which hinders or impedes motion; hence, an
      encumbrance, restraint, or impediment, of any kind.
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            All the ancient, honest, juridical principles and
            institutions of England are so many clogs to check
            and retard the headlong course of violence and
            opression.                            --Burke.
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   2. A weight, as a log or block of wood, attached to a man or
      an animal to hinder motion.
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            As a dog . . . but chance breaks loose,
            And quits his clog.                   --Hudibras.
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            A clog of lead was round my feet.     --Tennyson.
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   3. A shoe, or sandal, intended to protect the feet from wet,
      or to increase the apparent stature, and having,
      therefore, a very thick sole. Cf. Chopine.
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            In France the peasantry goes barefoot; and the
            middle sort . . . makes use of wooden clogs.
                                                  --Harvey.
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   Clog almanac, a primitive kind of almanac or calendar,
      formerly used in England, made by cutting notches and
      figures on the four edges of a clog, or square piece of
      wood, brass, or bone; -- called also a Runic staff, from
      the Runic characters used in the numerical notation.

   Clog dance, a dance performed by a person wearing clogs, or
      thick-soled shoes.

   Clog dancer.
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The Collaborative International Dictionary of English v.0.48:

Clog \Clog\, v. i.
   1. To become clogged; to become loaded or encumbered, as with
      extraneous matter.
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            In working through the bone, the teeth of the saw
            will begin to clog.                   --S. Sharp.
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   2. To coalesce or adhere; to unite in a mass.
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            Move it sometimes with a broom, that the seeds clog
            not together.                         --Evelyn.
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The Collaborative International Dictionary of English v.0.48:

Clog \Clog\, v. t. [imp. & p. p. Clogged (kl[o^]gd); p. pr. &
   vb. n. Clogging.]
   1. To encumber or load, especially with something that
      impedes motion; to hamper.
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            The winds of birds were clogged with ace and snow.
                                                  --Dryden.
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   2. To obstruct so as to hinder motion in or through; to choke
      up; as, to clog a tube or a channel.
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   3. To burden; to trammel; to embarrass; to perplex.
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            The commodities are clogged with impositions.
                                                  --Addison.
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            You 'll rue the time
            That clogs me with this answer.       --Shak.

   Syn: Impede; hinder; obstruct; embarrass; burden; restrain;
        restrict.
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WordNet (r) 3.0 (2006):

clog
    n 1: footwear usually with wooden soles [syn: clog, geta,
         patten, sabot]
    2: any object that acts as a hindrance or obstruction
    3: a dance performed while wearing shoes with wooden soles; has
       heavy stamping steps [syn: clog dance, clog dancing,
       clog]
    v 1: become or cause to become obstructed; "The leaves clog our
         drains in the Fall"; "The water pipe is backed up" [syn:
         clog, choke off, clog up, back up, congest,
         choke, foul] [ant: unclog]
    2: dance a clog dance
    3: impede the motion of, as with a chain or a burden; "horses
       were clogged until they were tamed"
    4: impede with a clog or as if with a clog; "The market is being
       clogged by these operations"; "My mind is constipated today"
       [syn: clog, constipate]
    5: coalesce or unite in a mass; "Blood clots" [syn: clog,
       clot]
    6: fill to excess so that function is impaired; "Fear clogged
       her mind"; "The story was clogged with too many details"
       [syn: clog, overload]