Related Clues:

• Null and
• Render null
• Cancellation stamp word
• { }, in mathematics
• Empty, as a mathematical set
• Kiss "Into the ___"
• Null and __ (not valid)
• Null and __
• Render inoperative
• "Null" companion
• Invalid somewhat unwell, unfit to get up
• __ and void (no longer valid)
• __ and void (not valid)
• ... and void, lacking any legal or binding force
• ''___ where prohibited''