One man stood above the log and the other in a pit below

• Two-handed log cutter
• Lumberjack's tool
• Tool for a pair of timber cutters
• Cutting tool handled by a couple of people
• Tool that it takes two to operate
• Log cutter for two
• Two-person tool
• A large two-handed saw formerly used to cut logs into planks

Wiktionary Word definitions in Wiktionary
n. A saw worked by two people, one standing on the log and the other beneath it, often in a pit.

WordNet Word definitions in WordNet
n. a large two-handed saw formerly used to cut logs into planks; one man stood above the log and the other in a pit below