Related Clues:

• Increases (with "to")
• Puts on the pile
• Joins in marriage
• Associates (with)
• Becomes a member of
• Does a certain math problem
• Throws together
• Opposite of subtracts
• Finds a total
• Chimes in
• Hobnobs with the guests
• Abandons bachelorhood
• Mixes thoroughly
• Calculates a total
• Amalgamates