`下级` is primarily a formal term used in specific contexts.
Workplace & Government: This is its most common usage. It's used in official reports, HR documents, formal meetings, and when discussing organizational structure. For example, a manager might say, “I need to assign this task to one of my subordinates (下级).”
Formal vs. Informal: You would almost never address someone directly as your `下级`. Calling out, “Hey, my subordinate!” (`喂,我的下级!`) would be considered rude, arrogant, and extremely awkward. Instead, you would use their name or job title. `下级` is a word used to *describe* a relationship, not to *address* a person.
Connotation: The word itself is neutral and descriptive. However, its usage can carry a feeling of distance and formality. In a friendly team environment, a good leader might prefer to use terms like `我的团队` (wǒ de tuánduì - my team) or `同事们` (tóngshìmen - colleagues) to foster a sense of collaboration rather than a strict hierarchy.