Related Clues:

• Repeals
• Cancels
• Zeroes
• Cancels out
• Makes void
• Nothings
• Dummy letters in cryptography
• Sets to zero
• Things of no value to students in their union
• Renders invalid
• Dummy letters in ciphers
• Voids partners?
• Dummy symbols in ciphers
• Invalidates or voids
• Renders void