fifth columnist

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Definitions from WordNet

Noun fifth columnist has 1 sense

fifth columnist, saboteur - a member of a clandestine subversive organization who tries to help a potential invader
--₁ is a kind of traitor, treasonist
--₁ is a member of fifth column, Trojan horse

Definitions from the Web

Definition: A fifth columnist refers to a person who sympathizes with and assists an enemy or opposing group within their own country, often serving as a spy or engaging in sabotage for their cause.

Example sentences:

During wartime, it is crucial to identify and neutralize any possible fifth columnists who may be compromising national security.
The government suspected the politician of being a fifth columnist, secretly working with the opposition party to undermine their policies.
The journalist received backlash for being accused of acting as a fifth columnist, consistently promoting a negative image of the country in his articles.
The spy network successfully infiltrated the fifth columnists, gathering vital intelligence to thwart their plans.

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