A "blocked drain" refers to a situation where something is blocking the normal flow of water through a pipe or channel, causing it to become clogged or backed up. Full definition
With the washer I was able to find repair instructions online and found that a small item, I think it was a dime both times, was blocking the drain hose. (604homes.com)
Be very aware of driving at speed through areas where water is laying on the road from blocked drains etc, as this can cause the vehicle to «aquaplane». (drivingtesttraining.com)
«We moved in October ending and what we met here was a terrible state of the road with inadequate and blocked drains which hinders the flow of rain water. (nigeriapoliticsonline.com)