Etymology

exercise for the reader

Today it means: Used other than figuratively or idiomatically: see exercise, for, the, reader. Full definition →

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The story

From academic writing. One of the first known recorded occurrences of this phrase is in An Elementary Course of Mathematics by Thomas Stephens Davies, Stephen Fenwick, and William Rutherford from 1853.

Etymology from Wiktionary, CC BY-SA 4.0.