What "does" it mean. When you "bite" something you are using your teeth to cut into something. In order to eat an apple you must "bite" it. Examples: Present or Future: I will bite the apple I will bite you. I am biting the apple Past: He bit the apple Why did he bite the apple? That bad dog bit me Why did you bite me? It really hurt. The cat took a bite out of her food.

I'll bite = I will bite (someone/something). Statement: At some time in the future it's your intention to bite a person/object. Examples: "Let go of me, or i'll bite you!" (a warning). "If your dog bites me, i'll bite him back!"