#1 sign n. [mark] a perceptible indication of something not immediately apparent (as a visible clue that something has happened); "he showed signs of strain"; "they welcomed the signs of spring". wn
#2 sign v. [subscribe] mark with one's signature; write one's name (on); "She signed the letter and sent it off"; "Please sign here". wn
#3 sign v. [ratify] approve and express assent, responsibility, or obligation; "All parties ratified the peace treaty"; "Have you signed your contract yet?". wn
#4 sign v. be engaged by a written agreement; "He signed to play the casino on Dec. 18"; "The soprano signed to sing the new opera". wn
#5 sign n. a public display of a message; "he posted signs in all the shop windows". wn
vizzz