Related Clues:

• Frequent joiner?
• Put in with
• Kick in
• Word on a dipstick
• Expand on
• Use a calculator
• Do arithmetic
• "What else?"
• Put into the mix
• "Not to mention ..."
• Put in with the rest
• Add at the last moment
• "Not only that ..."
• 'Then what?'
• Sentence extender