Something that is auspicious is basically something that is favorable. If you have an auspicious sign, it means that you are likely to encounter something lucky. In some cultures, a rabbit’s foot or a four leaf clover are lucky charms:
- If you carry around an auspicious rabbit’s foot, you should not be surprised if your boss chooses to give you a raise or if the person you have a crush on asks you on a date.
- If you see the auspicious symbol of a four leaf clover while in Ireland, chances are you will have great luck in the near future!
Basically, you should be able to substitute the word lucky for auspicious. If it makes sense, then you have used the word correctly.