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chock (adv.)

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

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."