clog_up
1. [ verb ] become or cause to become obstructed
Synonyms: clog choke_off congest choke foul back_up
Examples:

"The leaves clog our drains in the Fall" "The water pipe is backed up"

Related terms: unclog obstruct stuff silt_up gum_up crap_up congestion
Similar spelling:   close_up
  clock_up
  closeup