Maintain is a synonym of Defend. Defend is a type of Prevent. Prevent is related to Action. Action is related to Swim. 
Digital is the opposite of Continuous. Continuous is the opposite of Broken. Broken is related to Wound. Wound is related to Damage. 
Maintain <--Synonym--> Defend --IsA--> Prevent <--RelatedTo--> Action <--RelatedTo--> Swim 
Digital <--Antonym--> Continuous <--Antonym--> Broken <--RelatedTo--> Wound <--RelatedTo--> Damage 