Hello
The word "χρηστεύεται" is not used in everyday language. Since it is part of the theological terminology, it is best if you ask someone who studies theology.
I did find this source: http://biblehub.com/greek/5541.htm
According to it, "χρηστεύομαι" means "I am kind (full of service to others), gentle."
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Vasiliki Baskou, Instructor/Director, https://learn-greek-online.com.