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  1. The return or counterblast, as the recoil or backward suction of the air current, produced after a mine explosion. Also called backblast; suction blast.
  2. The reentry of air into a fan.
  3. The violent recoil and whipping movement of the free ends of a rope or wire cable broken under strain. Long
  4. Lost motion, play, or movement in moving parts such that the driving element (as a gear) can be reversed for some angle or distance before working contact is again made with the secondary element. ASM, 1

Source: Dictionary of Mining, Mineral, and Related Terms

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