Возвратный глагол; употребляется в прямом значении о разрушении и падении вниз и в переносном значении о резком снижении показателей.
plungeCommon in economics, markets, and statistics; implies a steep and sudden fall. Акции обваливаются на бирже.
Shares are plunging on the stock exchange.
collapseUsed for buildings, cliffs, structures, or other physical objects breaking down and falling. Скала начала обваливаться в море.
The cliff started to collapse into the sea.
plummetCommon in economics and finance; used for prices, currencies, indicators, or values dropping very sharply. Курс валюты обваливается.
The exchange rate is plummeting.
crumbleUsed when rock, earth, plaster, or another brittle material falls apart and breaks off. slumpOften used in finance and statistics; suggests a marked decline, usually less abrupt than plummet.