Related Clues:

• Make legally effective
• Endorse a check
• Leo or Libra
• Billboard
• Highway sight
• Communicate by hand
• Affix an X, maybe
• Make a contract legal
• Fluid overload
• Make it official
• Stem swelling
• What a catcher puts down
• Foreshadowing
• Affix a signature
• ''Stop'' or ''Yield''