Introduce is related to Bring. Bring is the opposite of Give. Given is derived from Give. 
Fit is related to Alter. Alter is related to Ego. Ego is a type of Pride. 
Introduce <--RelatedTo--> Bring <--Antonym--> Give <--DerivedFrom-- Given 
Fit <--RelatedTo--> Alter <--RelatedTo--> Ego --IsA--> Pride 