postage
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fit on the back of a postage stamp
Fit in a very small space, because there is very little content. This phrase is used to indicate that one knows very 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!
on the back of a postage stamp
In a very small space. Used to indicate an extremely limited or meager amount of knowledge about something. Why did they sit me next to a poetry professor at the wedding? Everything I know about poetry could fit on the back of a postage stamp! No one takes him seriously; he could write what he knows about socioeconomics on the back of a postage stamp.
postage and handling
The costs involved with packaging something and delivering it through the postal system. The gadget is just $59.99, plus $9.99 for postage and handling. The postage and handling was more expensive than the thing I bought!
postage and handling
charges for shipping [something] and for wrapping and handling the item. The cost of the book was quite reasonable, but the postage and handling was outrageous. They did not charge postage and handling because I prepaid the order.
on the back of a postage stamp
If you say that everything someone knows about a subject could be written on the back of a postage stamp, you mean they know very little about it. What she knew about children would have fitted on the back of a postage stamp.