Indicates a complete change, often before a major life event or a new start. After retiring, they sold up and bought a boat to sail the world.
Pro Tip 2/3
Not Rushed
Unlike 'fire sale', 'sell up' suggests a thought-out, voluntary process rather than a quick, forced sale. They took their time to sell up their family home after all their children moved out.
Pro Tip 3/3
Life Circumstances
Often used when life circumstances, such as retirement or downsizing, motivate the sale. The couple decided to sell up their mansion after the kids left for college.