Etymology
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cross-check (n.)

1903 in research and accounting, from the verbal phrase, from cross (adv.) + check (v.1). As a verb in hockey, "obstruct by holding one's stick across an opponent," from 1901; as a noun by 1968. Related: Cross-checked; cross-checking.

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Definitions of cross-check

cross-check (v.)
check out conflicting sources; crosscheck facts, for example;
From wordnet.princeton.edu