guard

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noun – 1. a device to prevent injury or loss, etc. The thermocouple probes consist of two wires of dissimilar metal that are joined together inside a metal guard tube. 2. a person who protects or keeps watch, a security guard verb – to protect from harm by watching over, to guard against to take steps to ensure that something does not happen. To guard against the risk of fire, passengers are requested not to smoke in the toilets

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