A seesaw (also known as a teeter-totter or teeter board) is a long, narrow board pivoted in the middle so that, as one end goes up, the other goes down.
The child car seat Synthesis XT Plus at home can also be used seesaw swing.
Terrapin Grade School had a tall "teeter-totter", the biggest seesaw I ever saw.
"can also be used *as a* seesaw swing"