noun An obstruction blocking a hole, pipe, etc. (somewhere in the pipes there is a plug of ice blocking the flow) A device for making an electrical connection, especially between an appliance and a power supply, consisting of an insulated casing with metal pins that fit into holes in an outlet. A piece of publicity promoting a product, event, or establishment. (he threw in a plug, boasting that the restaurant offered many entrées for under $5) A piece of tobacco cut from a larger cake for chewing. A lure with one or more hooks attached. short for fireplug A tired or old horse.
verb Block or fill in (a hole or cavity) (trucks arrived loaded with gravel to plug the hole and clear the road) Mention (a product, event, or establishment) publicly in order to promote it. (during the show he plugged his new record) Shoot or hit (someone or something). Proceed steadily and laboriously with a journey or task. (during the years of poverty, he plugged away at his writing)