The harness moves or move on a route. Usually described by the technical grade on a UK traditional climb
The hardest move on a route.
The most crucial, difficult section of a climb.
The most difficult section on the route.
The toughest move or sequence of moves on a climb.
The most difficult section of a climb. The crux could be a single move, a sequence of moves, or an entire pitch on a multi-pitch climb. A route is rated by the difficulty of its crux.
The hardest part of a climb, pitch or boulder problem.
the most difficult sequence or section of a pitch
The hardest move or sequence on any given route.
The hardest part on a climb.
That crucial point in the climb when the rubber in your shoes suddenly decides not to stick, your fingers feel like wooden blocks, the strength drains from your upper body like water down a sewer, and you forget even the most basic climbing technique.
The most difficult move or section of a pitch or route.
The most difficult section of a climbing route.
(n) the most crucial, difficult part of the climb
The hardest move on a pitch or the hardest pitch on a climb.