clog up

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WordNet Dictionary
	Definition:		[v]  become or cause to become obstructed; "The leaves clog our drains in the Fall"; "The water pipe is backed up"
	Synonyms:		back up, choke, choke off, clog, congest, foul
	Antonyms:		unclog
	See Also:		block, choke up, close up, crap up, gum up, impede, jam, lug, obstruct, obturate, occlude, silt, silt up, stuff