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general::
Phrase(s): split off (from something)
to separate away from something; to sever connection with and separate from something. • A large iceberg split off from the glacier and made an enormous splash. • A giant chunk of ice split off and floated away., Phrase(s): split something off (of) something [and] split something off
to sever connection with something; to separate from something. (Of is usually retained before pronouns.) • Dave split a piece of wood off the log to use for kindling. • He split off a stick of wood.
McGrawhill's American Idioms And Phrasal Verbs