Ankle is related to Heel. Heel is related to Back. Back is related to Retreat. Retreat is the opposite of Attack. 
Excuse is a synonym of Apology. Apology is related to Regret. Regret is related to Shame. 
Ankle <--RelatedTo--> Heel <--RelatedTo--> Back <--RelatedTo--> Retreat <--Antonym--> Attack 
Excuse <--Synonym--> Apology <--RelatedTo--> Regret <--RelatedTo--> Shame 