Assertion: viper's venom | /r/CapableOf | fold into protective sheath
Facets:
value: back up
type: MANNER
Source sentences:
text: Its venom destroys tissues (cytotoxic), and is injected by front-hinged fangs that fold outwards in an action similar to a switchblade when the mouth opens, and fold back up into a protective sheath when the mouth closes.