Final answer:
In database design, a many-one relationship translates into a foreign key which links two tables together, ensuring referential integrity.
Step-by-step explanation:
When implementing relationships in a database, each many-one relationship becomes a foreign key. A foreign key is a field in one table that uniquely identifies a row of another table. The foreign key thus establishes a link between the data in two tables and enforces referential integrity. For instance, if we have a table of employees and a table of departments, each employee is associated with one department. In the employee table, the department ID would be the foreign key that references the department table.