"patrol" in the noun sense
1. patrol
a detachment used for security or reconnaissance
2. patrol
the activity of going around or through an area at regular intervals for security purposes
3. patrol
a group that goes through a region at regular intervals for the purpose of security
"patrol" in the verb sense
1. patrol, police
maintain the security of by carrying out a patrol
Source: WordNet® (An amazing lexical database of English)
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