default has 4 distinct synonyms spread across 4 of its 5 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. Its one recorded opposite is pay up.
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.
loss resulting from failure of a debt to be paid
an option that is selected automatically unless an alternative is specified
Synonyms, antonyms and the broader and narrower relations for default come from Princeton University’s WordNet. Full sources and licences.