dunkirk has 1 distinct synonym spread across 2 of its 3 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
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”
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
Synonyms, antonyms and the broader and narrower relations for dunkirk come from Princeton University’s WordNet. Full sources and licences.