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drop safe
drop safe n.
Brit. 
/ˈdrɒp seɪf/
, /ˈdrɒp seɪf/U.S. /ˈdrɑp ˌseɪf/
a safe built into a floor for extra security./ˈdrɑp ˌseɪf/ΚΠ
1970 Herald (Roselle, Illinois) 12 Oct. i.4 All receipts go into the drop safe.
2001 E. Schlosser Fast Food Nation iii. 85 The leading fast food chains have tried to reduce violent crime by spending millions on new security systems—video cameras, panic buttons, drop-safes, burglar alarms.
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