The word capsized can mean different things depending on the context in which it is used. For example, if you are referring to a boat, it means that the vessel has overturned and is now floating upside down in the water. If you are referring to a person, it means that they have been knocked over or toppled. In both cases, the word capsized implies that something has gone wrong - either the boat has encountered rough waters and tipped over, or the person has lost their balance and fallen over.
The word capsized can also be used figuratively to describe any situation that has suddenly and unexpectedly gone wrong. For example, you might say My plans for the weekend just got capsized if your friends cancel on you at the last minute or The stock market just got capsized if there's a sudden crash. In these cases, capsized simply means overturned or turned upside down.