Assertion: yawning | /r/CapableOf | serve social function
Facets:
value: as a herd instinct
type: MANNER
Source sentences:
text: Yawning serves a social function, communicating boredom.
text: Yawning may serve a social function, particularly as a herd instinct.
text: Yawning might serve a social function (to communicate boredom) and a physiological function (regulation of body state).