Assault carried out on the king's highway; an ambush on that highway. It was one of the offences reserved to the king's judgement. The penalty was a fine of 100s. In the Latin records the offence was described as prohibitio itineris = hindrance of a journey. [< OldEngl. foresteall = hindrance (of justice), ambush] -
Dictionary of Medieval Terms and Phrases. Christopher Coredon with Ann Williams.