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perimeter
mastery UK /pəˈɹɪm.ɪ.tə(ɹ)/ US [pəˈɹɪm.ɪ.ɾɚ]noun
card 1 of 4 · preposition
The security guards walked _____ the perimeter of the building every two hours.
card 1 of 4 · preposition
The security guards walked _____ the perimeter of the building every two hours.