1、Thankfully, though, not by much.

2、A festivity characterized by much drinking.

3、Stocks rise, though perhaps not by much.

4、He is younger than I by much.; He is much younger than I.

5、Unemployment will edge up, but not by much.

6、Not as much as the hydrogen atom going from 1s to 2s to 2p, but still by much more than ordinary thermal energies at room temperature.