A garrote may be any sort of long, thin, flexible, and durable object, and is often used impromptu. A purpose-built garrote is usually made of Nylon or a strong metal, and has handles at either end to prevent the garrote from slipping out of the assailant's hands. A more discrete garrote is made of a guitar string or piano wire, with fabric threaded around either end to aid in grip. Once the garrote is around the target's throat, unconsciousness and then death come quickly.
verb: To attack and/or kill someone with a garrote.
The politician was swiftly garroted, and no one nearby was any the wiser.