Definition of karabiner noun from the Oxford Advanced Learner's Dictionary

 

karabiner

 noun
noun
BrE BrE//ˌkærəˈbiːnə(r)//
 
; NAmE NAmE//ˌkærəˈbiːnər//
 
 
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a metal ring that can open to allow a rope to pass through, used by rock climbers to attach themselves safely to things Word Origin 1930s: shortened from German Karabiner-haken ‘spring hook’.
See the Oxford Advanced American Dictionary entry: karabiner