sky·lark (sk??lärk?)n. Any of several larks of the genus Alauda of Eurasia and Africa, especially A. arvensis, having brownish plumage and noted for singing while in flight.intr.v. sky·larked, sky·lark·ing, sky·larks To play actively and boisterously; frolic.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.skylarking (?ska?l??k??) nsilly or frivolous behaviour, or joke-playingCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014