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fifth columnist - 2 dictionary results

fifth column

–noun
1. a group of people who act traitorously and subversively out of a secret sympathy with an enemy of their country.
2. (originally) Franco sympathizers in Madrid during the Spanish Civil War: so called in allusion to a statement in 1936 that the insurgents had four columns marching on Madrid and a fifth column of sympathizers in the city ready to rise and betray it.

fifth columnist, noun
fifth column  
n.  A clandestine subversive organization working within a country to further an invading enemy's military and political aims.

[First applied in 1936 to rebel sympathizers inside Madrid when four columns of rebel troops were attacking that city.]
fifth col'um·nism (kŏl'əm-nĭz'əm) n., fifth columnist n.
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