noun
Military term for a large-scale attack launched after turning the tide of battle. Used in historical and strategic contexts.
連合軍は反転攻勢に出て、敵陣を突破した。
The allied forces launched a counteroffensive and broke through the enemy lines.
反撃 is a more general term for a counterattack, while 反転攻勢 specifically implies a large-scale, strategic offensive after a defensive phase.
Compound of 反転 (reversal, turning around) and 攻勢 (offensive, aggressive campaign). The exact historical derivation is uncertain, but the term is used in modern military contexts.