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3. (as) sure as death and taxes

(as) sure as death and taxes

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(as) sure as death and taxes

Certain to happen; inevitable and unavoidable. A variation of the proverbial phrase, "Nothing is certain but death and taxes." They just aren't right for each other; they're sure as death and taxes to break up eventually. The two brothers will be forever at each other's throats, as sure as death and taxes.

See also: and, death, sure, taxes