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Crossword solution:
S
I
G
N
21 clues for "SIGN":
Omen.
Billboard.
Endorse.
Indication
Notice.
Placard
Portent.
Poster
Put under contract.
Shingle
Symbol.
Token.
Use the dotted line
Vestige
Affix one's John Hancock.
Foretoken
Gesture.
No Exit, for example.
"Stop," for one
"Stop" or "Yield"
Write on "the dotted line."