"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."
it was chock-a-block full
chlorophyll
chloroplast
choad
choate
chock
chock-a-block
chock-full
chocolate
chocolatey
chocolatier
Choctaw
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