fit on the back of a postage stamp

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fit on the back of a postage stamp

A phrase used when one knows little about something. The idea is that one could only fill a very small space—like the back of a postage stamp—writing what one knows about the topic. I am definitely going to fail this test—what I know about Victorian poetry could fit on the back of a postage stamp!
See also: back, fit, of, on, postage, stamp