Douglas Harper's Etymology Dictionary
also seesaw, 1630s, in see-saw-sacke a downe (like a Sawyer), words in a rhythmic jingle used by children and repetitive motion workers, probably imitative of the rhythmic back-and-forth motion of sawyers working a two-man saw over wood or stone (see saw (n.1). Ha ha.). Reference to a game of going up and down on a balanced plank is recorded from 1704; figurative sense is from 1714. Applied from 1824 to the plank arranged for the game.
also seesaw, "move up and down," 1712, from see-saw (n.). Related: See-sawed; see-sawing.
Wiktionary
n. (alternative spelling of seesaw English) vb. (alternative spelling of seesaw English)
Wikipedia
See-Saw is a Japanese pop duo (formerly a trio) originally from Tokyo, Japan. Its members include Chiaki Ishikawa (vocals) and Yuki Kajiura; former member left the group in April 1994 to pursue a writing career. The group temporarily disbanded in 1995, but reunited in 2001.
The duo of Ishikawa and Kajiura performed opening and ending themes in several anime series, including .hack//SIGN and .hack//Liminality, two insert songs for Noir, the first ending theme to Mobile Suit Gundam SEED, and the final ending theme to Mobile Suit Gundam SEED Destiny.
"See-Saw" is a song from Pink Floyd's 1968 album A Saucerful of Secrets. It tells of a strangely troubled brother-sister relationship.
Usage examples of "see-saw".
The see-saw bridged the gap between two types of space, and La Cucaracha yawed wildly down it, an indignity for an old lady who, at her age, should ride sedately through free void-but she was a hyper ship first and a lady second.
It rocked up and down like a see-saw, the farther end attached to a long rod which disappeared into the pump shaft.
And that safety was illusory for the racking jars of the spatial see-saw might disintegrate La Cucaracha in seconds.
Between this see-saw of the necessary subscriber and the necessary advertiser, a good many newspapers go down.
Terran ballads mixed with Liaden chorales mixed with bawdy spacing songs mixed with other things the like of which she'd never heard mixed with scraps of see-sawing notes that sounded like the melodies of children's rhyming games.
A bubble-shaped object plummeted through the sky, spun about and see-sawed in the open air as if choosing a place to land.
His route had see-sawed back and forth so often that he had lost track of distance in his effort to avoid an ambush.
As Nadon gave a slight bow, his ladle-shaped head see-sawed up and down.
As the voters had come in during the day, their hopes had see-sawed up and down.
We see-sawed very skillfully, so that we seldom were both in at the same time, or out.