prewarn

verb
pre·​warn | \ˌprē-ˈwȯrn \
variants: or pre-warn
prewarned or pre-warned; prewarning or pre-warning

Definition of prewarn 

transitive verb

: to warn (someone) beforehand : forewarn … in 1951, the network began to unravel, and two of its members, Donald Maclean and Guy Burgess, prewarned by fellow conspirators, jumped the night ferry to St.-Malo …— Stephen Koch

First Known Use of prewarn

circa 1624, in the meaning defined above

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The first known use of prewarn was circa 1624

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