Which of the verbs below has an opposite meaning of the phrasal verb “shoot up” in the ...

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Text I

Stat: Young Americans have been securing the bag since the pandemic, largely thanks to their portfolios popping off. The combined wealth of adults under forty has shot up 80% since 2019, compared to 10% for people 40–54 and 30% for the over-55 set, according to economists at the New York Fed. That’s in part because they were poorer than their elders to start with, so they got more Covid stimulus cash that they put into stocks, which have since had a good run. But money from stocks leaves young people exposed to a volatile asset, since the market…doesn’t always go up.

(Source: https://www.morningbrew.com/daily/issues/slime-bowl)