The lion is the king of the jungle, therefore the one who is dreaming about it will have a great fortune. The lion could also signify that there will be many barriers that you will have to overcome. If you are in fight with a lion, then such dream signifies the fact that you will overcome your evils, but only if you win that fight. If you lost the fight with the lion, then it means you will have to work even harder than usual. To get more detailed dream interpretation you should look deeper into the minor details you saw in the dream, as it would tell much more about your dream. The lions are also known as the symbolism of your sexuality. Perhaps you have too much tension and with for the sexual activities.
Read more about dreaming of Lion in other dream meanings interpretations.