I'm playing a game and looking at an item description. But for the life of me
I cannot find out what grammar concept is behind the bold portion of the
description.

I know the verb being used is 噛む (to chew). But I don't know how we got to
噛みちぎれない. It seems like its the verb stem 噛み plus negative ちぎれる. But I can't
find anything on the verb stem + another verb

The item description is

> **噛みちぎれない** ほど 硬～いフランスパン。でも 困った事にとても美味しいのである。 _Something about not chewing_
> hard French bread. But its very delicious for the annoyance.
CC BY-SA 4.0
2019-07-05T05:21:24.937
69271
2019-07-05T06:09:42.583
2019-07-05T06:09:42.583
30339
30339
question
grammar verbs
Don't understand meaning of verb stem + ちぎれない