I. see ‧ saw 1 /ˈsiːsɔː $ -sɒː/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Origin: Probably from ⇨ ↑ saw 2 ]
1 . a piece of equipment that children play on, made of a board that is balanced in the middle, so that when one end goes up the other goes down SYN teeter-totter American English
2 . a repeated movement from one state or condition to another and back again SYN oscillation
II. seesaw 2 BrE AmE verb [intransitive]
to keep changing from one state or condition to another and back again:
Before the election, the president seesawed in the polls.