I can stand for it' is a phrase that means to support or endorse something. It is often used in the context of political campaigns or social movements where people are urged to show their support for a cause or candidate. The term can also be used in other contexts such as business or personal relationships where ONE person is urging another to take a stand on an issue. In all cases, the phrase implies that the person is willing to publicly declare their support for whatever it is they are being asked to stand for.