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unleash someone or something against someone or something

to turn someone or something loose against someone or something. The army unleashed a horrible attack against the enemy. Max unleashed his bullies against the helpless merchants.
See also: unleash

unleash someone or something (up)on someone or something

to turn someone or something loose on someone or something. (Upon is formal and less commonly used than on.) The air force unleashed a bombing attack upon the enemy. The mob chief unleashed his tough guys on Lefty.
See also: on, unleash
References in periodicals archive ?
Camilla Bruckner, Director, UNDP Nordic Representation Office said, "UNDP's engagement at UNLEASH brings in our talent from across the world, and is a sign of our commitment to realise the SDGs through innovative ideas".
Customers can also join Unleash Perks, a special loyalty program from Sidoop that lets members receive perks, deals, and breaking news.
After authorizing Unleash to share the accounting data, users must select their industry type from the list of suggestions.
A recent Kempton outing was swerved when the ground got too soft for him because Unleash must have good going.
There looks to be plenty of scope for improvement, and Unleash can exploit what still looks a decent mark.
Approximately 400 "Unleash" journals were distributed in the UAE during the month of May, officially launching the Unleash Movement, which is sponsored by the Dubai Culture and Arts Authority (Dubai Culture).
Unleash (10-1) had been switched to top winter trainer Philip Hobbs last autumn and was a hit for Hobbs and Johnson over hurdles in the spring, but this was his first run back on the Flat.
But everything went like clockwork for Unleash, who started at 10-1 and was drawn in stall one.