1 [drej]
Also called dredging machine. any of various powerful machines for dredging up or removing earth, as from the bottom of a river, by means of a scoop, a series of buckets, a suction pipe, or the like.
a barge on which such a machine is mounted.
a dragnet or other contrivance for gathering material or objects from the bottom of a river, bay, etc.
verb (used with object), dredged, dredging.
to clear out with a dredge; remove sand, silt, mud, etc., from the bottom of.
to take, catch, or gather with a dredge; obtain or remove by a dredge.
verb (used without object), dredged, dredging.
to use a dredge.
Verb phrases
dredge up,
to unearth or bring to notice: We dredged up some old toys from the bottom of the trunk.
to locate and reveal by painstaking investigation or search: Biographers excel at dredging up little known facts.

1425–75; late Middle English (Scots) dreg-, Old English *drecg(e); see dray, draw

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2 [drej]
verb (used with object), dredged, dredging. Cookery.
to sprinkle or coat with some powdered substance, especially flour.

1590–1600; v. use of dredge (now obsolete or dial.) mixture of grains, late Middle English dragge, dregge, apparently to be identified with Middle English drag(g)e, dragie (disyllabic) sweetmeat, confection < Anglo-French drag(g)é, dragee, Old French (see dragée); compare similar dual sense of Medieval Latin dragētum, dragium

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dredge1 (drɛdʒ)
1.  Also called: dredger a machine, in the form of a bucket ladder, grab, or suction device, used to remove material from a riverbed, channel, etc
2.  another name for dredger
3.  to remove (material) from a riverbed, channel, etc, by means of a dredge
4.  (tr) to search for (a submerged object) with or as if with a dredge; drag
[C16: perhaps ultimately from Old English dragan to draw; see drag]

dredge2 (drɛdʒ)
to sprinkle or coat (food) with flour, sugar, etc
[C16: from Old French dragie, perhaps from Latin tragēmata spices, from Greek]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late 15c., from Scottish dreg-boat "boat for dredging," or M.Du. dregghe "drag-net," one possibly from the other but hard to tell which came first; probably ultimately from root of drag. The verb is attested from c.1500. Related: Dredged; dredging.
Online Etymology Dictionary, © 2010 Douglas Harper
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Bible Dictionary

Dredge definition

(Job 24:6). See CORN.

Easton's 1897 Bible Dictionary
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Example sentences
The other component would be dredging the main channels so the ruins are
  accessible to boats at all times.
If your test isn't precise enough, you may end up dredging up antibodies to
  other viruses.
But dredging up these negative thoughts isn't the only peril of positive
The other is data mining, that is, dredging up material from a vast store of
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