pit saw
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pit·saw
also pit saw (pĭt′sô′)n.
A large saw for cutting logs, operated jointly by a person standing above the log and another in a pit underneath.
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.