a splitting or separating into two or more parts.
a separation or dissociation of two groups or people.
Commerce. a process of reorganizing a corporate structure whereby all the capital stock and assets are exchanged for those of two or more newly established companies, resulting in the liquidation of the parent corporation. Compare spin-off ( def 1 ), split-off ( def 3 ).

1830–40; noun use of verb phrase split up

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Teams split-up and delicately excavated the entrances of each burrow with trowels.
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