Definition of love game. : a game (as in tennis) won without loss of a point.
In tennis, love is a word that represents a score of zero, and has been used as such since the late 1800s. It's not perfectly clear how this usage of love came to be, but the most accepted theory is that those with zero points were still playing for the "love of the game" despite their losing score.
Love in the tennis scoring system translates to a score of zero within a single game. For example, if you’re serving and you win the first point of a game, then the score would be 15-love. With that in mind, let’s do a quick review of how the score of love fits into a single game by outlining the point system quickly. Love: a score of zero.
At the beginning of the game, when both sides have no score, the game is love-love because in tennis, love means having a score of zero or nil. One point brings a player to 15, two to 30; and three to 40. The next point wins the game, unless a complex series of tiebreakers comes into play, because in order to win a tennis match, a player must win by a margin of two.
love game. noun. tennis a game in which the loser has a score of zero. 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. WORD OF THE DAY.
Linking. Lookup box. Close. love game. Also found in: Wikipedia. love game. n. (Tennis) tennisa game in which the loser has a score of zero. Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014.
love game in American English a game, as in tennis , in which the losing player or team scores no points Webster’s New World College Dictionary, 4th Edition.
Love game: Shutout game, won without the opponent scoring a single point.  Love : A score of zero (e.g. "15-0" is spoken "fifteen-love"; "to hold to love" means "to win the game when serving with the opponent scoring zero points"; "to break to love" means "to win the game when receiving with the opponent scoring zero points").