Choose the correct meaning of the following idiom:

A bigger bang for your buck

More for your money

The correct meaning of the idiom "a bigger bang for your buck" is more for your money. It means to get more value for your money, or to get a better return on your investment. For example, you might say that a certain product is a "bigger bang for your buck" if it is more affordable and provides more features than other similar products.

The other options are incorrect. Not for money means that something is not motivated by financial gain. More for your nature and more for your smile do not make sense in this context.