1. a rectangular board mounted on a fulcrum, for use by acrobats and gymnasts to gain momentum in feats of tumbling.
2. a similar board, used in exercising, on which the body rests on an inclined plane, with the legs on a higher level than the head and arms.
3. New Eng. See tilting board .
Also, tiltboard .
Regional Variation. 3. See seesaw .