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crack has 36 distinct synonyms spread across 15 of its 24 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 very sharp explosive sound
“His gun cracked”
hit forcefully; deal a hard blow, making a cracking noise
“The teacher cracked him across the face with a ruler”
pass through (a barrier)
“Registrations cracked through the 30,000 mark in the county”
gain unauthorized access computers with malicious intentions
“she cracked my password”
reduce (petroleum) to a simpler compound by cracking
break into simpler molecules by means of heat
“The petroleum cracked”
a purified and potent form of cocaine that is smoked rather than snorted; highly addictive
Synonyms, antonyms and the broader and narrower relations for crack come from Princeton University’s WordNet. Full sources and licences.