Swallow is a synonym of Buy. Buy is related to Acquisition. Acceptance is a type of Acquisition. Acceptance is related to Ask. 
Weight is derived from Weigh. Weight is related to Being. Being is related to Safety. 
Swallow <--Synonym--> Buy <--RelatedTo--> Acquisition <--IsA-- Acceptance <--RelatedTo--> Ask 
Weigh <--DerivedFrom-- Weight <--RelatedTo--> Being <--RelatedTo--> Safety 