The phrasal verb "shut down" is versatile and commonly used across both informal and formal contexts, though it leans slightly more towards informal speech. In formal settings, it often appears in professional or technical discussions, referring to the turning off of machines or computers, or the cessation of operations in a business or industrial context. Informally, it may pertain to ending a conversation abruptly or dismissing someone's opinions or feelings. It can also describe the act of a person withdrawing emotionally or mentally. In both cases, it implies a cessation of activity, whether it's stopping physical machinery or closing off personal communication. The usage of "shut down" has been consistent, reflecting its adaptability to various situations, making it a staple in modern English phrasing.
B1
PreIntermediate
1. To stop the operation of a machine or system.
The computer will automatically shut down after an hour of inactivity.
We need to shut down the air conditioning system before conducting the maintenance work.
2. To cease business operations permanently or temporarily.
The company had to shut down several stores due to declining sales.
The factory shut down for the holidays and will reopen in January.
3. To stop someone from expressing themselves, often abruptly or harshly.
Every time I try to suggest improvements, he shuts me down.