Learn English – Help understanding “so airtight can’t anybody meddle with it” – should it be “so airtight that”

meaning-in-contextsentence-structure

“I mean young grown-ups. You’re lucky, you know. You and Jem have the
benefit of your father’s age. If your father was thirty you’d find life quite
different.”

“I sure would. Atticus can’t do anything…”

“You’d be surprised,” said Miss Maudie. “There’s life in him yet.”

“What can he do?”

“Well, he can make somebody’s will so airtight can’t anybody meddle with it.”

(To Kill a Mockingbird)

I feel like something is missing in the sentence cause there's two verbs(can/can't), and thus having difficulty understanding what this sentence means. If this sentence originally has 'that', I still feel like there has to be a subject. (He can make somebody's will so airtight that …(?)) Can anyone help me with this?

Best Answer

You are on the right track. Will is the subject; it is a noun in this sentence.

The second half of the sentence is written in a nonstandard dialect form. In standard English, it would be "...that nobody can meddle with it."

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