Tumble: to fall rapidly in value or amount.

Seesaw: change rapidly and repeatedly from one position, situation, or condition to another and back again ( Share prices see-sawed all day.)

I came across the two words in the dictionary while I was looking up another word. 😄😄

I'm wondering that whether they are appropriate for WT1 or not. Would you give me your opinion?

They are often used in newspaper accounts of the stock market and stock prices.

However, they are not particularly acceptable in a math/science context. The main context is a children's playground.