Etymology
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chock-a-block (adj.)

"jammed together," 1840, nautical, said of two blocks of tackle run so closely they touch; from chock + block (n.1) in the nautical sense "a pulley together with its framework."

updated on November 14, 2017

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Definitions of chock-a-block from WordNet

chock-a-block (adv.)
as completely as possible;
it was chock-a-block full
Synonyms: chock
From wordnet.princeton.edu, not affiliated with etymonline.