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|Verb||1.||clog up - become or cause to become obstructed; "The leaves clog our drains in the Fall"; "The water pipe is backed up"|
gum up - stick together as if with gum; "the inside of the pipe has gummed up"
obturate, occlude, close up, impede, obstruct, jam, block - block passage through; "obstruct the path"
crap up - become obstructed or chocked up; "The drains clogged up"