club·bing (kl?b??ng)n. A condition in which the ends of the fingers and toes are enlarged and the nails are shiny and abnormally curved.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.clubbing (?kl?b??) n1. the activity of frequenting nightclubs and similar establishmentsCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014