Third-person singular simple present indicative form of tumble.(verb)
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Use "tumbles" in a sentence
"The craft tumbles from the sky, and tears a burning gash into the earth."
"There also seems to be a serious scam involved -- stiffing public hospitals of the subsidies they receive to treat uninsured patients, on the ridiculous assumption that everybody will simply go out and buy health insurance the moment the proposal tumbles from the President's mouth tonight."
"While the grey clouds of autumn gather elsewhere, and the word tumbles into financial meltdown, where better to take time out from such cares?"