A vocabulary of landscape — a landscape of words
1054 entries
jam
A climbing technique: wedging a hand or foot into a crack in the rock, then twisting or expanding it to create a secure hold. Hand jams, finger jams, fist jams — each size of crack demands a different solution. Good jamming is painful. Great jamming is painful and reliable.
Etymology
English climbing terminology, mid-20th century. From the general sense of forcing something into a tight space.