You looks like you will die soon

行将就木is a idiom, 行means movement;将means “is going”;木 is wood, coffin is usually made of wood, this 木 is the meaning of coffin, 就木means going into coffin. Sp this idiom means someone is going to die.

行将就木 is about to enter the coffin. Refers to a person nearing death.

就express a scorn attitude