bluff

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bluff

1. a steep promontory, bank, or cliff, esp one formed by river erosion on the outside bend of a meander
2. (of a bank, cliff, etc.) presenting a steep broad face
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

bluff

[bləf]
(geography)
A steep, high bank.
A broad-faced cliff.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.