a swimming kick in which the legs make rapid alternate up-and-down movements while the knees remain rigid, as in the crawl.
Origin of flutter kick
First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
a type of kick used in certain swimming strokes, such as the crawl, in which the legs are held straight and alternately moved up and down rapidly in the water
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