teedle board

tee·dle board

 (tēd′l)
n. Northeastern Massachusetts
See seesaw.

[Probably alteration of teeterboard.]
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.