Something which portends or is perceived to portend either a good or evil event or circumstance in the future, or which causes a foreboding; a portent or augury.
A thing of prophetic significance.
To divine or predict from omens.
To be an omen of.
Something spoken or written that is intended to warn.
The action of the verb warn; an instance of warning someone.
Used to warn of danger in signs and notices.