Chasin-
When my Sifu (Wong Tat Mau) refers to a leg sweep, he calls it "So Girk". So when Sifu Parella says So Choy to mean sweeping punch, seems to make sense.
Also, I think his dialect is in Toisanese.
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so girk is cantonese
the so in so girk and the sow in sow choy is different characters