Assertion: grouse's wing | /r/CapableOf | set the air
Facets:
value: in motion
type: OTHER
value: beneath them
type: LOCATION
Source sentences:
text: However, the wings do not touch any object in the manner of drumsticks, but simply beat the air to and fro rapidly enough to set the air beneath them in motion, resulting in a low-frequency rumble—approximately 60 cps.