‘易主’ literally means ‘to change master’ — ‘易’ (yì) means ‘to change, to exchange’, and ‘主’ (zhǔ) means ‘master, owner, or principal’. Together, the term refers to a formal or notable transfer of ownership, typically of property, a business, a website domain, or even an animal in breeding contexts. It carries a neutral-to-formal register and often implies a significant, documented handover rather than casual sharing or temporary use.

This word is commonly used in news reports, legal documents, and business discussions — for example, when a company is acquired, a historic building changes hands, or a prized pet is sold to a new breeder. While it can apply to any owned object or entity, it’s rarely used for everyday items like pens or clothes; instead, it highlights importance, permanence, or institutional relevance in the transfer.