One of the mysteries of the English language finally explained.
An act of wedging an open hand in a crack as a handhold.
1no object To climb by using a hand jam or hand jams. With up, over, etc.
2with object To wedge an open hand in (a crack) as a handhold.
1940s. From hand + jam. Compare earlier hand-jamming<br>1960s; earliest use found in Punch. From hand + jam, after hand jam.
hand jam/ˈhan(d) dʒam/
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