Related Clues:

• Interpose
• Supplement (with ''to'')
• Contribute to the conversation
• Double-check the check
• Dipstick word
• Just-water connection
• Write a P.S., e.g.
• Perform an certain operation
• Attach (to)
• Calculate the sum
• Problem in focusing, for short
• Calculate a total
• Find the total
• Make a summation?
• Tally up