flash freeze
1 of 2verb
variants or less commonly flash-freeze
ˈflash-ˈfrēz 
flash froze also flash-froze ˈflash-ˈfrōz ; flash frozen also flash-frozen ˈflash-ˈfrō-zᵊn ; flash freezing also flash-freezing; flash freezes also flash-freezes
; flash frozen also flash-frozen ˈflash-ˈfrō-zᵊn ; flash freezing also flash-freezing; flash freezes also flash-freezes transitive verb
: to freeze rapidly
The physician then inserts a specialized catheter through the endoscope, selects the targeted area and sprays liquid nitrogen to flash freeze the tissue. 
Business Wire
Business Wire especially : to freeze something (such as food) quickly to minimize the formation of ice crystals
Large catcher-processor vessels that flash freeze shrimp whole … account for the majority of the shrimp catch in Alaska. Santi Roberts
Santi Roberts The farm stand offers its own produce … ; … flash-frozen wild salmon; local ice cream; and a variety of locally made dressings, honey and condiments. Maureen Sullivan
Maureen Sullivan flash freeze
2 of 2noun
variants or less commonly flash-freeze
plural flash freezes also flash-freezes
: a rapid drop in atmospheric temperature to below the freezing point causing water on the ground to quickly become ice
Temperatures were expected to plummet on Thursday morning leading to a flash freeze. Robert Pore
Robert PoreIt occurs when there's a rapid drop in temperatures causing a quick freeze of water already on the ground from rain or melted snow. A flash freeze is different from freezing rain, said Becky Kern, a meteorologist with the National Weather Service in Valley. Michael O'Connor
Michael O'Connor
Word History
First Known Use
Verb
1941, in the meaning defined above
Noun
1940, in the meaning defined above