Related Clues

• Do basic arithmetic
• Say further
• Supplement
• Explain further
• Use a postscript
• Tally (up)
• Contribute
• Raise, with "to"
• Go on to say
• Make sense, with "up"
• Subjoin
• Put together, in a way
• Put a wing (on)
• Sum (up)
• Put two and two together
• Use an abacus
• Tack on
• Recipe word
• Combine
• Build (on)