'ambusher' originates from the Old French word 'embuschier', where 'em-' meant 'in' and 'busch' meant 'wood' or 'forest'.

'embuschier' transformed into the Middle English word 'ambushen', and eventually became the modern English word 'ambush'.

Initially, it meant 'to hide in the woods for an attack', but over time it evolved into its current meaning of 'a surprise attack'.