If you say that someone or something unleashes a powerful force, feeling, activity, or group, you mean that they suddenly start it or send it somewhere.
双语例句
例： The announcement unleashed a storm of protest from the public.
公告在公众中引发一场抗议风暴。
例： The officers were still reluctant to unleash their troops in pursuit of a defeated enemy.
军官们仍不愿发兵追击溃敌。