What does the word seesaw mean?

Usage examples for seesaw

  1. I declare I know no more why the minds of human beings should be so restlessly agitated about things which, as most of them own, give more pain than pleasure, than I understand why that swarm of gnats, which has such a very short time to live, does not give itself a moment's repose, but goes up and down, rising and falling as if it were on a seesaw, and making as much noise about its insignificant alternations of ascent and descent as if it were the hum of men. – Kenelm Chillingly, Complete by Edward Bulwer-Lytton
  2. In this as in similar problems the obvious and simple rule should be followed of having those matters which no particular State can manage taken in hand by the United States; problems which in the seesaw of conflicting State legislatures are absolutely unsolvable are easy enough for Congress to control. – Complete State of the Union Addresses from 1790 to the Present by Various