UK [ʌnˈliːʃ] / US [ʌnˈlɪʃ] verb [transitive]
Word forms "unleash":
present tense I/you/we/they unleash he/she/it unleashes present participle unleashing past tense unleashed past participle unleashed
1) to do or to cause something that has a very powerful or harmful effect

The new tax laws have unleashed a storm of criticism.

2) to allow someone or something to be free when they were previously strictly controlled

English dictionary. 2014.