be (as) large as a barge
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 large as a barge now. When she said she bought a boat, I was expecting a little schooner or something, but this thing was large as a barge! This package is practically as large as a barge! How do you expect me to carry it to the post office?
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