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Wiktionary
let loose

vb. (context transitive idiomatic English) To free; to release from restraint.

WordNet
let loose
  1. v. express audibly; utter sounds (not necessarily words); "She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand" [syn: utter, emit, let out]

  2. turn loose or free from restraint; "let loose mines"; "Loose terrible plagues upon humanity" [syn: unleash, loose]

Wikipedia
Let Loose

Let Loose are a British pop/ rock trio, featuring Richie Wermerling (born Richard John Wermerling, 11 May 1968 in Whitechapel, London) on lead vocals and keyboards, Rob Jeffrey (born Robert George Edward Jeffrey, 30 November 1967 in Romford, Essex) on guitars and backing vocals, and Lee J. Murray (born 14 May 1970 in Edgware, Middlesex) on drums, percussion and backing vocals. The reformed lineup were due to tour the UK on the "Another Time, Another Place" arena tour in November 2014, however the tour was cancelled only two weeks after tickets went on sale.

Let Loose (album)

Let Loose is the debut, self-titled album released by British band Let Loose, released on November 10, 1994. It is the first studio album to be recorded by the original line-up of the band, and features the band's biggest hit, " Crazy for You". The album also spawned the singles "Seventeen", "One Night Stand", "Best in Me" and "The Way I Wanna Be". The album was also released as a limited edition picture disc vinyl in the United Kingdom.

Usage examples of "let loose".

It was only when I finally explained to him that if any malign influence had been let loose the first day, at any rate, it was out now for good or evil, and no further going or coming of mine could make any difference, that I finally gained my point.