Be a warning of synonyms

What is another word for Be a warning of?

• betoken
• foretell
• signal
• herald
• prophesy
• foreshadow
• presage
• be a harbinger of
• portend
• augur
• be an omen of
• be a sign of
• warn of
• bode
• forebode
• give notice of
• proclaim
• foretoken
• threaten
• give a warning of
• promise
• be an indication of
• indicate
• point to
• add up to