Crows and ravens are believed to messengers of bad news so in dreams they can represent a bad feeling you have about something right now. What is worrying you the most right now? If the bird is just present in the dream and not doing much then that signifies the presence of the bad feeling you have. If the bird is attacking then it may be a sign you are allowing your worry to get the best of you. If the bird is sick or dying then that is a good sign what you are worried about is on its way out.
A crow in a dream can also be a reference to “eating crow” in real life. Have you felt humiliated recently? Have you been proven wrong? Are you having to take back something you said?