Definition

Noun: A fifth columnist is a member of a secret, subversive group operating within a country. This person works to undermine national strength or morale to assist an external enemy or potential invader. The term implies betrayal from within.

Usage

The term is used to describe a traitorous agent working covertly inside a nation, organization, or community. - It functions as a countable noun. - It often carries a strong negative and accusatory connotation.

Examples

• The general warned that fifth columnists within the government were leaking secrets to the enemy.
• During the war, anyone expressing dissent was suspected of being a fifth columnist.
• The revolution failed partly because of fifth columnists who sabotaged the supply lines.

Advanced Usage

• The concept is often used in political, military, and corporate contexts to describe insider threats.
• "To act as a fifth columnist": To engage in secret, subversive activities from within.

Variants and Related Words

• Fifth column (noun): The clandestine subversive organization itself.
• Subversive (noun/adj): A person seeking to overthrow or undermine a system.
• Saboteur (noun): A person who engages in deliberate obstruction or damage.
• Infiltrator (noun): A person who enters an organization secretly to gain information or influence.

Synonyms

• Traitor
• Collaborator (specifically with an enemy)
• Quisling
• Subversive agent
• Enemy within (idiomatic phrase)

Related Idioms and Phrases

• "Enemy within": A phrase describing a threat originating from inside a country or group, closely related to the concept of a fifth columnist.
• "Trojan horse": Something intended to undermine or subvert from within, often referring to a deceptive strategy rather than a person.

Noun

1. a member of a clandestine subversive organization who tries to help a potential invader