give away has 20 distinct synonyms spread across 2 of its 4 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
make a gift of
“She gave away her antique furniture”
make known to the public information that was previously known only to a few people or that was meant to be kept a secret
“The auction house would not disclose the price at which the van Gogh had sold”
formally hand over to the bridegroom in marriage; of a bride by her father
Synonyms, antonyms and the broader and narrower relations for give away come from Princeton University’s WordNet. Full sources and licences.