withdrawn – this means that there is still a contract in place between the seller and the broker. The home is technically not active for sale though. While a home is withdrawn the days on the market at not counted.
cancelled – this means that the contract between the seller and the broker has been cancelled. The home did not sell. The seller will either find another broker to sell the home and relist or not go back on the market.
expired – this means that the contract between the seller and the broker has reached the expiration date. The home did not sell. The seller will either relist with the same broker, relist with another broker, or not relist with anybody.
In general the withdrawn, expired, and cancelled indicators show how many homes are NOT selling in a given period, (in this case a week) As markets deteriorate, these numbers grow as homes grow stale and do not sell because of lack of demand, and/or incorrect pricing.