Topic: JAIL AND PUNISHMENT
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guard2 [transitive]
1 to protect a person, place, or object by staying near them and watching them : 
The Sergeant told Swift to guard the entrance.a lioness guarding her cubs
The Sergeant told Swift to guard the entrance.a lioness guarding her cubs guard somebody/something against something There is no one to guard these isolated farms against attack.
There is no one to guard these isolated farms against attack.2SCJ to watch a prisoner to prevent them from escaping
3 to protect something such as a right or a secret by preventing other people from taking it away, discovering it etc :
4 to prevent another sports player from gaining points, getting the ball etc
guard against something
phrasal verbExercise can guard against a number of illnesses.
