Till alarm

a device for sounding an alarm when a money drawer is opened or tampered with.

See also: Till

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
New Jersey and Rhode Island, upon all occasions, discovered a warm zeal for the independence of Vermont; and Maryland, till alarmed by the appearance of a connection between Canada and that State, entered deeply into the same views.