(Australia) To encourage (especially a dog) to attack.
My neighbour sooled her bull mastiff onto my chihuahua, because she was sick of its yapping and wanted it to meet its demise.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.