This is the 12439th most frequent German word.
vorkommen
"Vorkommen" means "to occur" or "to happen."
In this sentence, 'vorkommen' is used in the sense of 'to occur' or 'to happen.' It describes an event that could happen occasionally.
Das kann schon einmal vorkommen.
That can happen sometimes.
Here, 'vorkommen' is used to describe the presence or existence of something in a particular location, meaning 'to be found' or 'to appear' in this context.
Wale kommen in den Ozeanen vor.
Whales occur in the oceans.
In this example, 'vorkommen' is used reflexively ('mir vor') and signifies perceiving something or forming an impression about it, translated as 'to seem' or 'to appear.'