To make something sweet in taste or to enhance the sweetness of something.

मीठा बनाना

English Usage: She sweetened the tea with honey.

Hindi Usage: उसने चाय को शहद से मीठा किया।

Something that has been made sweet.

मीठा किया गया

English Usage: The sweetened yogurt was a hit at the party.

Hindi Usage: मीठा किया गया दही पार्टी में बहुत पसंद किया गया।