noun
guerrilla; guerrilla warfare
Refers to irregular military fighters or the tactics they use. Often used in compounds like ゲリラ戦 (guerrilla warfare).
ゲリラが山岳地帯で活動している。
Guerrillas are operating in the mountainous area.
政府軍はゲリラ戦に苦しめられた。
The government forces were plagued by guerrilla warfare.
noun-modifying (irregular)
Prenominal use describing something that appears suddenly and locally, like a guerrilla attack. Most common in the compound ゲリラ豪雨 (sudden torrential downpour).
See also: ゲリラ豪雨
ゲリラ豪雨で駅前が冠水した。
The area in front of the station was flooded by a sudden torrential downpour.