fōrˈwȯ(ə)rn, fȯr-; fōəˈwȯ(ə)n, fȯ(ə)ˈ- transitive verb
Etymology: Middle English forwarnen, forewarnen, from for-, fore- fore- + warnen to warn — more at warn
: to warn in advance: as
a. : to give previous notice or information to
we were forewarned to expect you before dark
b. : to caution in advance especially in the form of an admonition
let me forewarn you, young man, you'll be sorry if you are late for supper
Synonyms: see warn