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Ref: vkura114a4.
But Kuraishi doesn't say anything like "maybe; probably". His definition is 思いきってほうりっぱなしにして, which matches the HDC definition (完全撒手。比喻对事情放手不管。) quite well.
Web example: 他倒好,对这事儿不闻不问,“大撒巴掌”(放任自流)了。
Also, Kuraishi says 巴 has 1st tone.