One of the phrases used to describe “insomuch” was “worn down” as in insomuch is worn down from Old English or Old German..”

It is old

So old it is now uncommon,

Even rare

In is in

So is so

Much is much

To such a degree

To such an extent

In a way that is so

Much

Shaken down

Pressed down

Made to be more

To the degree or extent we

Are close to Jesus.

Univerbation….