syn: sign, omen, portent refer to something that gives evidence of a future event. sign is a general word for a visible trace or indication of an event, either past, present, or future: Dark clouds are a sign of rain.
SIGN meaning: 1 : a piece of paper, wood, etc., with words or pictures on it that gives information about something; 2 : something (such as an action or event) which shows that something else exists, is true, or will happen often + of