Assail comes from an Anglo-French verb, assaillir, which itself traces back to the Latin verb assilire ("to leap upon"). Assilire combines the prefix ad- ("to, toward") with the Latin verb salire, meaning "to leap." (Salire is the root of a number of English words related to jumping or leaping, such as somersault and sally, as well as assault, a synonym of assail.) When assail was first used in the 13th century, it meant "to make a violent physical attack upon." By the early 15th century, English speakers were using the term to mean "to attack with words or arguments." Now the verb can refer to any kind of aggressive encounter, even if it is not necessarily violent or quarrelsome, as in "Upon entering the room, we were assailed by a horrible odor."