faraamush

I have a couple hunches regarding the etymology of the modern Farsi
compound verb "faraamush kardan". I'd like the list's opinion as to
which they consider more likely.

The first, and most likely in my opinion, is that it descends from the
Old Persian particle "fra-" which as I understand it has the
connotation of "off, out, forth" and "ushi" - which means
"intelligence" (cf. modern Farsi "hush", "Daariush", OP
"Daarayavaush"). The question here would be where the "am" in the
middle comes from -- is it a remnant of enclitic "maa", in the sense
of "let not"?

The second, and less likely hunch is that it is descended from a
certain conjugation of an Old Persian verb. Specifically:

fra- + a (per rules for forming imperfect) + *mau-? + sh (3rd person
singular conjugation for imperfect)

wherein the result would be "fraamush" to mean "He Forgot" and later
was coopted into its own compound verb[*]

... however, there is no verb "mau-" on record.

As my studies in Old Persian and Young Avestan are strictly amateur
hobbies, I haven't seen enough examples to determine which is more
likely, though I am leaning toward the former.

Thoughts?

[*] similar to how the imperfect of "bara-", became Farsi "aavordan"
(Skjaervø, "An Introduction to Old Persian," p. 50)