A crowd is a large group of people who have gathered together, for example to watch or listen to something interesting, or to protest about something. A huge crowd gathered in a square outside the Kremlin walls... The crowd were enormously enthusiastic... The explosions took place in shopping centres as crowds of people were shopping for Mothers' Day. If a situation or problem arises , it begins to exist or people start to become aware of it. The birds also attack crops when the opportunity arises. = occur If something arises from a particular situation, or arises out of it, it is created or caused by the situation. ...an overwhelming sense of guilt arising from my actions. When you arise , you get out of bed in the morning. (FORMAL) He arose at 6:30 a.m. as usual.