Плач
Освобождение, которого день не позволил.
Crying in a dream is the dictionary's image for releasing what the day refused to release. It is rarely a sad dream by itself — the dreamer most often wakes feeling lighter than they went to sleep.
Crying without being able to stop is a backlog. The day-to-day has been allowing none of it through and the dream has volunteered to do the work alone. Watching someone you love cry is the dream noting that you have sensed something they are carrying and have not yet acknowledged to them.
Where you often see it. Crying at something that did not warrant it in waking life. Crying in front of a stranger. The dream uses crying for release the day did not allow.
What it is not. Crying in a dream is rarely a sadness premonition. The dictionary reads it as the held material finally moving.
Related in the dictionary. Read crying with rain (its weather counterpart), water, and any scene where feeling finally found its way out.