clap skate
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clap skate
n.
A speed skate that has a blade attached by a hinge at the front, allowing one to skate more efficiently by keeping the full length of the blade on the ice while the heel is raised.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.