whipsaw
verb [ T ]
STOCK MARKET, FINANCE uk/ˈwɪpsɔː/ usto influence shares, etc. in a way that makes their value change very quickly, so that it is difficult to know what will happen next:
Fluctuations in world energy prices have whipsawed the fortunes of oil companies for decades.
be/get whipsawed New York shares were whipsawed, with an early recovery giving way to a short-lived bloodbath at midday.