Красный
Интенсивность. Страсть, гнев, кровь — то, что требует вашего внимания.
Red in a dream is the dictionary's image for intensity. It is not by itself good or bad; it is heat. A red dress, a red door, a red flag — the dream is signalling that the thing in red is loaded with energy.
If the red feels good in the dream, the dictionary reads it as desire that is welcome. If the red feels alarming, it is signal — the dream is telling you to pay attention to a real situation that the rest of your mind has been minimizing.
Where you often see it. Red blood in a quiet scene. A red object held in your dream-hand. Red light that does not flash but holds. The dream uses red when something is asking your full attention — passion, anger, or vitality, depending on the rest of the dream.
What it is not. Red is not danger by default and not always anger. It is intensity; the dream supplies the flavour through context.
Related in the dictionary. Read red with fire (when energy is consuming), blood (when red is vital), and the heart (when red is feeling). Pair with white when the dream is showing intensity beside clarity.