Intransitive verb meaning to climb large rocks; basis of the sport 'bouldering'.
Definitionen
To climb on large rocks or small rock faces without the use of ropes; to engage in bouldering. They spent the afternoon bouldering along the riverbank.
Attributive use before another noun (e.g., 'boulder field').
Definitionen
Relating to or consisting of large rocks; used before another noun. The hikers navigated a vast boulder field.