From Longman Dictionary of Contemporary Englishloose something on/upon somebody/something phrasal verb literaryEFFECT/INFLUENCEto allow something dangerous or harmful to begin to affect a situation or other people the evils loosed upon humanity in World War II → loose→ See Verb table
Examples from the Corpus
loose on/upon • A sweet shop then was a veritable Aladdin's Cave for children, for most sweets were sold loose.• Get that rope loose and get on.• Pete sounded muffled. and as he turned Marcus noticed that he too had a loose thread on his shirt.• A couple of sheets of corrugated iron broke loose and fell on Mr pugh's head.• Fat Man was loosed on Nagasaki on August 9.• There was a loose thread on one of Carter's shirt buttons.• Pupils at work in their press room, a loose box on the Royal Agricultural Society's Children's Farm.• It is loose laid on underfelt like an enormous rug with a surround of polished wooden floors. 