Synonyms of 'patrol'
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If you guard a place, person, or object, you stand near them in order to watch and protect them.
Gunmen guarded homes near the cemetery.
A guard is someone such as a soldier, police officer, or prison officer who is guarding a particular place or person.
The prisoners overpowered their guards and locked them in a cell.
Thesaurus for patrol from the Collins English Thesaurus
When soldiers , police , or guards patrol an area or building, they move around it in order to make sure that there is no trouble there.