clog / kläg; klôg/ • n. 1. a shoe with a thick wooden sole.2. an encumbrance or impediment: a clog in the system.• v. (clogged, clog·ging) [tr.] fill or block with an accumulation of thick, wet matter: the gutters were clogged up with leaves. ∎  [intr.] become blocked in this way: too much fatty food makes your arteries clog up. ∎  fill up or crowd (something) so as to obstruct passage: tourists clog the roads in summer.

clog

clog (dial.) block of wood XIV; wooden-soled shoe XV. of unkn. orig.
Hence clog vb. fetter, hamper, encumber. XIV.