American Heritage Dictionary
(3)
Century Dictionary
(12)
GNU Webster's 1913
(4)
WordNet
(2)
Elsewhere on the web
Modern knappers might also recognize one another's work, but they are likely to see it on the Internet, or at one of the "knap-ins" held around the country.— Kentucky.com: Homepage
Beach says he travels to more than 30 events like the knap-in at Moundville this weekend, where he both shares his skills and sells selected pieces to the public.— news | TL | http://www.tuscaloosanews.com
Betsy Irwin, education outreach coordinator for the park, said she expects about 30 artists and craftsmen at the knap-in and several hundred visitors at the event.— news | TL | http://www.tuscaloosanews.com

American Heritage Dictionary (1)
Century Dictionary (3)
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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