Related Clues:

• Makes binding
• Black cats, say
• Augurs' readings
• "Open" and "Closed"
• They're meaningful to the superstitious
• Bluebirds, to some
• Forecaster's concerns
• + and —
• Highway warnings
• They may be held up by fans
• "As a first-time parent, I noticed some early, worrisome ___ ..."
• Signs of danger
• Portents or road indicators
• Signs or warnings for the future
• Prophetic signs of good or evil