| 2. | blockage - an obstruction in a pipe or tube; "we had to call a plumber to clear out the blockage in the drainpipe"breech closer, breechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing vapor lock, vapour lock - a stoppage in a pipeline caused by gas bubbles (especially a stoppage that develops in hot weather in an internal-combustion engine when fuel in the gas line boils and forms bubbles that block the flow of gasoline to the carburetor) | |