Assertion: viper's fang | /r/CapableOf | fold up against the roof of its mouth
Facets:
value: in use
type: TEMPORAL
Source sentences:
text: When a viper closes its jaw, its fangs fold up against the roof of its mouth.
text: Typical of vipers, the fangs are too long for the closed mouth and fold up against the roof of the mouth when not in use.