1) Alert 2) Inform 3) Previse 1) Alert ahead of time 2) Exclusively Saxon word 3) Exclusively Anglo word 4) Give a premonition 5) Give an early warning 6) Previse 7) Tip off 8) To warn in advance 9) Warn 10) Warn in advance or beforehand 11) Word with Anglo-Saxon origins 12) Word of purely Anglo origin 
• (v. t.) To warn beforehand; to give previous warning, admonition, information, or notice to; to caution in advance.
Fore·warn' (fōr*warn') transitive verb [ imperfect & past participle Forewarned (-warnd'); present participle & verbal noun Forewarning .] To warn beforehand; to give previous warning, admonition, information, or notice to; to cauti...
[v] - warn in advance or beforehand
previse verb warn in advance or beforehand; give an early warning; `I forewarned him of the trouble that would arise if he showed up at his ex-wife`s house`
to warn in advance.