Etymology
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chock (n.)

1670s, "piece of wood, block" (especially one used to prevent movement), possibly from Old North French choque "a block" (Old French çoche "log," 12c.; Modern French souche "stump, stock, block"), from Gaulish *tsukka "a tree trunk, stump."

chock (adv.)

"tightly, close up against," 1799, back formation from chock-full.

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Definitions of chock
1
chock (v.)
secure with chocks;
chock (v.)
support on chocks;
chock the boat
2
chock (n.)
a block of wood used to prevent the sliding or rolling of a heavy object;
Synonyms: wedge
3
chock (adv.)
as completely as possible;
it was chock-a-block full
Synonyms: chock-a-block
From wordnet.princeton.edu