one-way mirror


noun

a sheet of glass that can be seen through from one side and is a mirror on the other, used especially for observation of criminal suspects by law-enforcement officials or witnesses.

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Question 1 of 7
What does “vacillate” mean?
Also called two-way mirror .
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020