A Clog

1. A type of shoe with an inflexible, often wooden sole sometimes with an open heel.
2. A blockage.
3. (Britain, colloquial) A shoe of any type.
4. A weight, such as a log or block of wood, attached to a person or animal to hinder motion.
5. That which hinders or impedes motion; an encumbrance, restraint, or impediment of any kind.