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offlap

[awf-lap, of-]
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noun Geology.
  1. the retreat of a sea from its shore.
  2. a sequence of layers of sedimentary rock formed during a retreat of the sea.

Origin of offlap

First recorded in 1905–10; off + lap3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018