chock

[chok]
noun
1.
a wedge or block of wood, metal, or the like, for filling in a space, holding an object steady, etc.
2.
Nautical.
a.
any of various heavy metal fittings on a deck or wharf that serve as fairleads for cables or chains.
b.
a shaped support or cradle for a ship's boat, barrel, etc.
c.
a small wooden piece or timber for filling a gap, reinforcing an angle, etc., in a wooden vessel.
3.
Metalworking. a bearing supporting the end of a rolling mill.
4.
Mining. a roof support made of cribbing filled with stones. Compare cog3 ( def 2 ).
verb (used with object)
5.
to furnish with or secure by a chock or chocks.
6.
Nautical. to place (a boat) upon chocks.
adverb
7.
as close or tight as possible: chock against the edge.

Origin:
Middle English < Anglo-French choque (compare modern Picard choke big log, Normandy dial. chouque), Old French çoche (French soche); of uncertain origin

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World English Dictionary
chock (tʃɒk)
 
n
1.  a block or wedge of wood used to prevent the sliding or rolling of a heavy object
2.  nautical
 a.  a fairlead consisting of a ringlike device with an opening at the top through which a rope is placed
 b.  a cradle-like support for a boat, barrel, etc
3.  mountaineering See nut
 
vb
4.  (Brit) (usually foll by up) to cram full: chocked up with newspapers
5.  to fit with or secure by a chock
6.  to support (a boat, barrel, etc) on chocks
 
adv
7.  as closely or tightly as possible: chock against the wall
 
[C17: of uncertain origin; perhaps related to Old French çoche log; compare Provençal soca tree stump]

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

chock
1674, possibly ult. from O.N.Fr. choque "a block," from O.Fr. çoche "log," from Gaul. *tsukka "a tree trunk, stump."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If this keeps going, innovation will be chocked off.
He then began to chocked her until she stopped moving.
The backhoe was on an incline, and the wheels were not chocked to hold the
  backhoe in place.
Because he had chocked the wheels, his life was saved.
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