Make a board even smaller

• Further shorten, maybe
• Cut smaller boards
• Visited again
• Further shorten, as lumber
• Cut lumber into smaller pieces
• Spotted again
• Cut again, as a board

Wiktionary Word definitions in Wiktionary
Etymology 1 vb. (context transitive English) To saw again or anew. Etymology 2 vb. (en-simple pastresee)

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Resaw \Re*saw"\ (r?-s?"), v. t. To saw again; specifically, to saw a balk, or a timber, which has already been squared, into dimension lumber, as joists, boards, etc.