Sack entails/necessarily involves Destroy. Destroy is a different concept from Build. Build is the opposite of Weaken. Collapse is a type of Weaken. 
Importance is related to Significant. Significant is the opposite of Minute. Minute is related to Segment. Segment is related to Word. 
Sack --Entails--> Destroy <--DistinctFrom--> Build <--Antonym--> Weaken <--IsA-- Collapse 
Importance <--RelatedTo--> Significant <--Antonym--> Minute <--RelatedTo--> Segment <--RelatedTo--> Word 