1. To be overwhelming or overpowering to one due to superiority in strength, numbers, etc. We played a good game, but their offense was just too much for us.

2. To be too difficult, arduous, or overwhelming for one; to be more than one can handle. Come on, you just had the flu—going back to work might be too much for you right now.

3. To be intolerable. In this usage, "be too much" is often a set phrase. Your boss's constant demands are just too much—you really need to resign.