Definition of sign:

part of speech: verb

To attach one's name to; to ratify by signature or seal; to indicate by a sign.

part of speech: noun

That by which a thing is known; a token; a wonder; a miracle; a symbol; a gesture instead of words; any significant mark; something intended to serve as a proof or type; indication; something set up on a house to show the tenant's occupation; a visible representation; in astron., the twelfth part of the ecliptic; in alg., a character or symbol indicating the relation between quantities; in med., anything by which the presence of disease is made known.

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One engaged in buying and selling commodities; a vessel sailing with goods for trading. ...