'bullseye' originates from the combination of 'bull' and 'eye', where 'bull' refers to the animal and 'eye' refers to the center or focal point.

'bullseye' changed from the literal meaning of 'the eye of a bull' to its current usage as the center of a target.

Initially, it meant 'the eye of a bull', but over time it evolved into its current meaning of 'the center of a target'.