guerrilla

American  

[guh-ril-uh] / gəˈrɪl ə /

Or guerilla

noun

1. a member of a band of irregular soldiers that uses guerrilla warfare, harassing the enemy by surprise raids, sabotaging communication and supply lines, etc.

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adjective

1. pertaining to such fighters or their technique of warfare: guerrilla tactics.

   guerrilla strongholds;

   guerrilla tactics.

2. of or relating to an unauthorized, edgy, or disruptive version of an activity: guerilla gardening to beautify an abandoned lot.

   guerrilla filmmaking on a busy sidewalk;

   guerilla gardening to beautify an abandoned lot.

guerrilla British  

/ ɡəˈrɪlə /

noun

1. 1. a member of an irregular usually politically motivated armed force that combats stronger regular forces, such as the army or police

   2. ( as modifier )

      guerrilla warfare

2. a form of vegetative spread in which the advance is from several individual rhizomes or stolons growing rapidly away from the centre, as in some clovers Compare phalanx

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Other Word Forms

• antiguerrilla
  noun
• counterguerrilla
  adjective
• guerrillaism
  noun

Etymology

Origin of guerrilla

First recorded in 1800–10; from Spanish, diminutive of guerra “war” (of Germanic origin) + -illa diminutive suffix; originally in reference to the Spanish resistance against Napoleon; the name for the struggle erroneously taken as a personal noun; cf. war ¹, -elle

Explanation

If your brother says he’s going to become a guerrilla, he's not planning to become a hairy animal. Guerrilla fighters band together in a small underground army, usually trying to overcome a larger and more organized force. Guerrilla and gorilla are pronounced the same — which makes it easy to remember how to say guerrilla — but they have different meanings. In Spanish, guerra means "war" and guerrilla means “little army.” Guerrilla fighters tend to work in small groups and use ambush and sabotage to surprise stronger, more traditional forces. You might have heard of Che Guevara, a famous guerrilla fighter who was involved in the Cuban Revolution.

Example Sentences

Its bearded guerrilla fighters inspired 1960s student movements from Paris to Mexico City.

From The Wall Street Journal • May 25, 2026

Gallrein is close to Louisville in a county that features multiple distilleries and a history of Confederate guerrilla violence during the Civil War.

From Slate • May 19, 2026

Colombia's largest active guerrilla group said Monday it was open to resuming peace talks with whoever succeeds left-wing President Gustavo Petro in upcoming elections.

From Barron's • May 4, 2026

This wasn’t “an argument between genteel parties in Congress,” William Hogeland writes in his history, The Whiskey Rebellion, “but…a guerrilla war on the country’s ragged margin, our first war for the American soul.”

From Barron's • Apr. 14, 2026

Though de Wet had said he believed that guerrilla warfare had not yet begun, we were taking no chances.

From "Long Walk to Freedom" by Nelson Mandela

Related Words

• commando
• mercenary
• terrorist