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Phonetics
verb
To close, terminate, or end.
Example: They are planning to shut down the entire building at the end of the month.To turn off or stop.
Example: It's a good idea to shut down the machine before you leave.To emotionally withdraw into oneself as a defense mechanism; to block out external stressors.
Example: I can't talk to him about a certain thing; he just shuts down anytime I try.(auto racing, car culture) To pass (another vehicle), especially quickly.