To divvy up means to divide something into shares and distribute them among a group of people. When you and your friends divvy up a pizza, you're splitting it so everyone gets a fair portion. When a team divvies up responsibilities for a science project, each member takes on specific tasks.

The phrase sounds casual and friendly, which matches how it's used. You might divvy up Halloween candy with your siblings, divvy up the cost of a gift, or divvy up chores around the house. The word suggests a practical, fair-minded approach to sharing: nobody's fighting over who gets what; everyone's working together to make sure the division makes sense.

Divvy is actually short for divide, and adding up emphasizes completing the action. You'll notice people often use this phrase when the division matters but isn't too serious or formal. A lawyer wouldn't say the court will “divvy up” assets in a legal case; she'd say “divide” or “distribute.” But friends divvying up leftover french fries? That sounds exactly right.