| 2. | choke off - 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" crap up - become obstructed or chocked up; "The drains clogged up" silt, silt up - become chocked with silt; "The river silted up" | |