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English definition of “guard”

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guard

noun [C]
 
 
/ɡɑːd/
WORKPLACE a piece of equipment that protects the user of a machine from being injured by a sharp or dangerous part on the machine: Make sure that the safety guard is in position before using the cutting machine.
a person or group of people whose job is to protect a person, place or thing, or to prevent a person, such as a criminal, from escaping: a night guard at a bank border/prison/security guards
be on your guard (against sth) to be careful to avoid being tricked or getting into a dangerous situation: Stores must always be on their guard against credit card fraud.
(Definition of guard noun from the Cambridge Business English Dictionary © Cambridge University Press)
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