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Phrase(s): stuff something up something
to force something upward or up into something. • He tried to hide the book by stuffing it up the chimney. • Sam stuffed the money he found up the downspout, where he thought no one would find it., Phrase(s): stuff something up
to plug something by stuffing something in its opening. • He stuffed the hole up with old newspapers. • Liz stuffed up the hole with paper.
McGrawhill's American Idioms And Phrasal Verbs