Verb
express audibly; utter sounds (not necessarily words)
turn loose or free from restraint
Source: WordNetWithout the beat in the background, Jazz basically sounds like an armadillo was let loose on the keyboard. Bill Bailey
When the tongue or the pen is let loose in a phrenzy of passion, it is the man, and not the subject, that becomes exhausted. Thomas Paine
This is the age of oddities let loose. Lord Byron
Unless you are educated in metaphor, you are not safe to be let loose in the world. Robert Frost
And sun and moon and starry fires and earth and air and sea Are creatures from the deep let loose who pause in ecstasy, Or wing their wild and heavenly way until again they find The ancient deep and fade therein, enraptured, bright and blind. George William Russell
A statement once let loose cannot be caught by four horses. Japanese Proverb