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Definition of Fifth columnist
1. Noun. A member of a clandestine subversive organization who tries to help a potential invader.
Exact synonyms: Saboteur
Group relationships: Fifth Column, Trojan Horse
Generic synonyms: Traitor, Treasonist
Group relationships: Fifth Column, Trojan Horse
Generic synonyms: Traitor, Treasonist
Definition of Fifth columnist
1. Noun. someone who belongs to a group that secretly undermines another organization ¹
¹ Source: wiktionary.com