A more thorough explanation:

Term: in solo alieno
Definition: In solo alieno means on someone else's land. It is a Latin phrase used to describe a situation where someone is on land that belongs to someone else.
Examples: If you are walking through your neighbor's yard without their permission, you are in solo alieno. If you are camping on private property without the owner's consent, you are also in solo alieno. These examples illustrate the definition because in both cases, the person is on land that belongs to someone else without their permission.