a log large enough to saw into boards.
Origin of saw log
An Americanism dating back to 1750–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for saw log
Are you a inviten' me to pound you over the head with a saw-log?The Citizen-Soldier|John Beatty
He saw the boiling eddies of the Halfway Pool, capable of sucking down a saw-log.The Forest|Stewart Edward White
He may fall offen a saw-log and git drowned, and you git her yit.Si Klegg, Book 5 (of 6)|John McElroy