noun
a type of rock climbing where the climber ascends without the use of ropes or other protective equipment
adjective
describing the act of rock climbing without ropes or other protective equipment
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The climber attempted a free solo ascent of the treacherous cliff.
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I can't believe he's going to free solo that mountain without any ropes!
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Dude, did you see that crazy guy free soloing that rock face?
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Taking on this project feels like a free solo climb, with no safety net in place.