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bergsteigen berg+steigen  vi sep irreg aux sein or haben, infin and ptp only to go mountain climbing  or  mountaineering, to mountaineer 
bergsteigen gehen  to go mountain climbing  or  mountaineering 
(das) Bergsteigen  mountaineering, mountain climbing 

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"Collins German Dictionary, complete & unabridged, 5th edition 2004, © William Collins Sons & Co. Ltd. , 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004"