World English Dictionary
alcolock (ˈælkəʊˌlɒk)
informal a breath-alcohol ignition-interlock device, which is fitted to the ignition in certain motor vehicles. The driver must blow into a tube and, if his or her breath contains too much alcohol, a lock is activated to prevent the vehicle starting
[C21: from alco(hol) + lock1 (sense 2)]

Collins English Dictionary - Complete & Unabridged 10th Edition
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