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A fault against the server, as in tennis, called for failure to keep both feet behind the baseline.
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.
(Tennis) tennis a fault that occurs when the server fails to keep both feet behind the baseline until he has served
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the failure of the server in tennis, volleyball, etc., to keep both feet behind the base line until the ball is hit or to keep at least one foot on the ground while hitting the ball.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
An illegal move. The server is on or over the base line, or walks or runs while serving.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
foot faultn (Tennis) → fallo di piede
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995