a listless, lazy, or restless feeling commonly associated with the beginning of spring.
What Exactly Is The Spring Equinox?Whether you're celebrating spring or autumn, the March equinox represents an interesting moment in our latest journey around the sun.
Origin of spring fever
An Americanism dating back to 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for spring fever
the feeling of restlessness experienced by many people at the onset of spring
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012