I. ˈsē-ˌsȯ noun
Etymology: probably from reduplication of saw (III)
Date: 1704
1. : an alternating up-and-down or backward-and-forward motion or movement ; also : a contest or struggle in which now one side now the other has the lead
2.
a. : a pastime in which two children or groups of children ride on opposite ends of a plank balanced in the middle so that one end goes up as the other goes down
b. : the plank or apparatus so used
• seesaw adjective
II. verb
Date: 1712
intransitive verb
1.
a. : to move backward and forward or up and down
b. : to play at seesaw
2. : alternate
seesaw between two activities
transitive verb
: to cause to move in seesaw fashion