Intransitive verb meaning to climb large rocks; basis of the sport 'bouldering'.
They spent the afternoon bouldering along the riverbank.
Ils ont passé l’après-midi à faire du bloc le long de la berge.
Attributive use before another noun (e.g., 'boulder field').
The hikers navigated a vast boulder field.
Les randonneurs ont traversé un vaste champ de blocs.