[Mesorah] Yid-mu vs Yi-demu

[Michael Kopinsky via Mesorah]

Why does a dagesh in the daled double the mem in the shoresh? Should
that turn it to d-d-m?

On Thu, Jan 29, 2015 at 7:06 PM, Mandel, Seth via Mesorah
<mesorah at lists.aishdas.org> wrote:
> the real difference is in the dagesh. With a dagesh, it is from the root
> d-m-m, meaning to be silent (and, of course, the shwa is na'). Without
> the dagesh, it is from the root d-m-h, meaning to be similar (and the
> sh'wa is silent).

> Cherchez la dagesh, which is in place of doubling.
...
> ________________________________________
> From: Mesorah on behalf of Gershon via Mesorah [mesorah at lists.aishdas.org]
> Sent: Thursday, January 29, 2015 4:50 PM
> To: mesora at aishdas.org
> Subject: [Mesorah] Yid-mu vs Yi-demu

> Can our learned membership opine on the Sheva in this word in the
> shiras hayam having a different meaning as na or nach?