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double tide

noun
  1. agger(def 1).
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agger

[aj-er]
noun
  1. Also called double tide. Oceanography.
    1. a high tide in which the water rises to a certain level, recedes, then rises again.
    2. a low tide in which the water recedes to a certain level, rises slightly, then recedes again.
  2. (in ancient Roman building) an earthen mound or rampart, especially one having no revetment.
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Origin of agger

1350–1400; Middle English: heap, pile < Latin: rubble, mound, rampart, equivalent to ag- ag- + -ger, base of gerere to carry, bring
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for double-tide

agger

noun
  1. an earthwork or mound forming a rampart, esp in a Roman military camp
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Word Origin

C14: from Latin agger a heap, from ad- to + gerere to carry, bring
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012