Brave is the opposite of Weak. Weak is related to Delicate. 
Fall is the opposite of Increase. Increase is a synonym of Expand. Expand is the opposite of Reduce. Reduce is a synonym of Limit. 
Brave <--Antonym--> Weak <--RelatedTo--> Delicate 
Fall <--Antonym--> Increase <--Synonym--> Expand <--Antonym--> Reduce <--Synonym--> Limit 