in a nutshell

Concisely or compactly, usually referring to written or spoken words. The Roman writer Pliny in his Natural History stated that Homer’s great (and very long) epic poem, the Iliad, was copied in such tiny handwriting that the whole text could be enclosed in a nutshell. This obvi- ous hyperbole caught the imagination of numerous subsequent writers who referred to “the Iliad in a nutshell,” among them Jonathan Swift and Thomas Carlyle. Later “the Iliad” was dropped and anything extremely compressed was described as being in a nutshell, a cliché since the mid-nineteenth cen- tury. See also IN A WORD