A deep cleft or chasm, especially in a glacier or mountainous terrain; a glacial crevasse.
From an old Germanic or Scandinavian root related to 'crack' or 'cleft,' possibly influenced by glacier terminology. It's a regional or dialectal term for deep fissures in ice.
Glacks (glacial crevasses) are hidden death traps for mountaineers—fresh snow can cover them completely, and a climber can fall hundreds of feet without warning!
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