Boast is related to Lie. Lie is a type of Be. Fit is a type of Be. 
Refuse is related to Decline. Decline is the opposite of Rally. Rally is a type of Recover. Recover is a synonym of Regain. 
Boast <--RelatedTo--> Lie --IsA--> Be <--IsA-- Fit 
Refuse <--RelatedTo--> Decline <--Antonym--> Rally --IsA--> Recover <--Synonym--> Regain 