American Heritage Dictionary
(4)
Century Dictionary
(3)
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
Will they be chock-a-block full of earmarks and / or a bridge-to-nowhere rammed through by closure (again)?— Progressive Bloggers
It was easy to find, because the immediate area was chock-a-block with police.— Dawg's Blawg
Despite its size and rather low key shop face, it was chock-a-block full with cool bikes.— Bike Hugger
This issue is chock-a-block with links to interesting and helpful blog posts and online articles and resources.— pfblogs.org: The Ad-Free Personal Finance Blogs Aggregator
Most of it is delivered in Sorkin's signature chock-a-block style and with walk-and-talk urgency.— dealspl.us

American Heritage Dictionary (1)
Century Dictionary (2)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word about once a year.
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