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Phrase(s): *a bull in a china shop
Prov. a very clumsy creature in a delicate situation. (*Typically: as awkward as ~; like ~.) • I never know what to say at a funeral. I feel like a bull in a china shop, trampling on feelings without even meaning to. • Lester felt like a bull in a china shop; reaching for an orange, he made several elaborate pyramids of fruit tumble down.
McGrawhill's American Idioms And Phrasal Verbs
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An extremely clumsy person, as in Her living room, with its delicate furniture and knickknacks, made him feel like a bull in a china shop. The precise origin for this term has been lost; it was first recorded in Frederick Marryat's novel, Jacob Faithful (1834).
American Heritage Idioms