To make a gift of something; to donate. She decided to give away her old clothes to charity.
To reveal or disclose something, often unintentionally. He tried to keep the surprise party a secret, but his smile gave it away.
To betray or expose someone. The spy was careful not to give away his true identity.
To present a bride to the groom at a wedding ceremony. Her father was proud to give her away on her wedding day.