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general::
Phrase(s): block something up
to obstruct something; to stop the flow within a channel. • The heaps of debris blocked the channel up. • The leaves blocked up the drain., Phrase(s): block someone up
to constipate someone. • That food always blocks me up. • He blocked himself up by eating something he shouldn’t. • That vile stuff would block up anybody!
McGrawhill's American Idioms And Phrasal Verbs