- fifthcolumn
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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 colʹum·nism (kŏlʹəm-nĭz'əm) n. fifth columnist n.
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Universalium. 2010.