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collapse [collapsed, collapsing, collapses]▼(to fall down suddenly; to cave in)verb[UK: kə.ˈlæps] [US: kə.ˈlæps]
fall down▼(to fall to the ground)verb[UK: fɔːl daʊn] [US: ˈfɑːl ˈdaʊn]
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