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1. a plank balanced in the middle so that two people seated on the ends can ride up and down by pushing on the ground with their feet
2. the pastime of riding up and down on a seesaw


An early system on the IBM 701.

[Listed in CACM 2(5):16 (May 1959)].
References in periodicals archive ?
The seesaws came alive as people climbed on board, and the intensity of corresponding light and sound varied as the structures dipped up and down.
Seesaw word ladders are ladders that alternate or seesaw between lists of transpositions (anagrams) of just two words (or alphomes) that differ by a single letter (ie, word stools: 02-288).
Members of the Veco employees' union converted the old wooden electric poles into seesaws, used tires of Veco service vehicles into swings and obstacle course, two wood spools for wires into round tables and crates into a playhouse with a slide.
The park is now wearing a deserted look as it seems to be a vandalized spot left with all seesaws broken, boundary wall worn out and even the iron rods of the wall and structure of seesaws have been fleeced.
Four concept cartoon books have been written by the Naylors (2000a, 2000b, 2000c, 2000d): The snowman's coat and other science questions, The seesaw and other science questions, Bungee jumpers and other science questions and The upside down seeds and other science questions.
These early chapters might appear intended for children, describing not only skaters but also falling balls, seesaws, and bumper cars.
She experiences great conflict, internally seesaws between hatred and love, as she searches for the answer: did her mother desert her?
The students straightened up, bringing their seesaws into balance.
Cass observed that because of safety concerns, there are no more 12-foot tall metal slides, bulking jungle gyms, kid-powered merry-go-rounds, seesaws and the like.
No court ever held that seesaws are too dangerous, but who will protect the school board if one youngster gets off too soon and the other child breaks an ankle?
A previously barren grass area has been transformed with seesaws, slides, climbing frames and small picnic tables for the youngsters.
In chilly, overcast conditions, hundreds of spectators watched as Taylor and scores of other owners coached their dogs jumping hurdles, climbing seesaws, leaping through hoops and zigzagging through dozens of tightly-packed plastic rods and other obstacles racing against the clock.