be (as) big as a barn
To be exceptionally large, bulky, or fat. Tom used to be really athletic in high school, but he's put on a ton of weight. He's as big as a barn now. When she said she bought a boat, I was expecting a little schooner or something, but this thing was big as a barn! This package is practically as big as a barn! How do you expect me to carry it to the post office?
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