Definition of "Dunkirk" :

noun: an amphibious evacuation in World War II (1940) when 330,000 Allied troops had to be evacuated from the beaches in northern France in a desperate retreat under enemy fire

noun: a seaport in northern France on the North Sea; scene of the evacuation of British forces in 1940 during World War II

noun: a crisis in which a desperate effort is the only alternative to defeat

"The Russians had to pull off a Dunkirk to get out of there."