Assertion: sail | /r/HasProperty | mainsail
Facets:
value: on boats
type: LOCATION
value: always
type: TEMPORAL
value: usually
type: DEGREE
Source sentences:
text: A rigid flat plate at the top of a sail (usually a mainsail), which serves as a reinforcement, an attachment point for the halyard, and an attachment point for the highest luff slider.
text: On boats which have only one sail, this sail is always called the MAINSAIL (the "main" sail on the boat).