1. In climbing, to free solo is to climb with no protection to catch a fall. The climber relies only on his or her ability.

2. In highlining, to free solo is to walk a highline without a leash or harness to prevent a fall. The highliner relies only on his or her balance and ability to catch the line to keep from falling.
Only the best highliners in the world are able to free solo.
by TheGrainmaker October 16, 2010
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Alain climbed 100 towers in 2011.😃😃😱
I went free solo
by Sup cool boss September 5, 2015
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