stýfa úr hnefa

Icelandic

From stýfa (“shorten”) + úr (“from”) + hnefa, the dative of hnefi (“fist”).

(rare, with accusative) to eat something from one's hand (not using utensils), to take a bite of something in one's hand, to bite apart
Maðurinn þagði en stýfði svo brauðið úr hnefa.
The man was quiet but then started to eat the bread.