Quoted: While Tom Purnell — a University of Wisconsin-Madison professor of English language and linguistics — was living in Pennsylvania in the mid-1980s, he said the cash dispensing machines in that area were called MAC (money access centers).
“ATM (automated teller machine) is the generic term that is being used more widely now, overtaking the local variants,” he said in an email.
“A lot of changes and variations in pronunciation reflect things that not just happen in our mouths, but also what happens in our ears,” said Joe Salmons, a longtime professor of language sciences at the University of Wisconsin-Madison.
In many languages, when there’s an “l” at the end of a syllable, it will mess with how people hear a preceding vowel, he explained, especially when the “l” is in the same syllable.
A similar example of this is pillow v. “pellow,” he noted.
The “melk” pronunciation is also heard in other parts of the Midwest, he said. And while it’s not exclusive to the state, it appears to be most common in eastern Wisconsin.