rock bump

rock bump

[′räk ‚bəmp]
(mining engineering)
The sudden release of the weight of the rocks over a coal seam or of enormous lateral stresses.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The hard man of rock bumped into Kenickie - aka drink and drug addict Jeff Conaway - at a Marilyn Manson gig.
When, 15 000 years ago, the first ancestors with whom we can feel any kinship tapped magic and made the marks that translated irregular rock bumps and fissures into the limbs of terrifyingly powerful bison and reindeer, they chose to work on very special places: caverns deep in the bowels of the mountains, often reached with difficulty from the palaces in which they normally lived.