penny post

English

Noun

penny post (plural penny posts)

1. (historical) Any of various postal systems in which a letter could be sent for the price of one penny.
   • 1854 August 9, Henry D[avid] Thoreau, “Where I Lived, and What I Lived For”, in Walden; or, Life in the Woods, Boston, Mass.: Ticknor and Fields, →OCLC:

     The penny-post is, commonly, an institution through which you seriously offer a man that penny for his thoughts which is so often safely offered in jest.