Select the most appropriate meaning of the given idiom.

A big gun

An important figure

The most appropriate meaning of the idiom "a big gun" is an important figure. This idiom refers to someone who is very powerful or influential. The image of a big gun is one of strength and power, and so the idiom is used to describe someone who is a major player in a particular field.

The other options for the meaning of the idiom are not accurate. An important question is a question that is of great significance or importance. An independent person is someone who is self-reliant and does not rely on others. Seem unwell means to appear to be sick or not feeling well.