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lengthen has no recorded synonym. 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 shorten.
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.
become long or longer
“In Spring, the days lengthen”
Synonyms, antonyms and the broader and narrower relations for lengthen come from Princeton University’s WordNet. Full sources and licences.