tr.v. o·ver·learned also o·ver·learnt (-lûrnt′), o·ver·learn·ing, o·ver·learns
To continue studying or practicing (something) after initial proficiency has been achieved so as to reinforce or ingrain the learned material or skill.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Psychology) relating to repetitive practice or learning
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014