centralize (v.)

• affiliate
• ally
• approach
• associate
• bunch
• cabal
• center
• close
• club
• concenter
• concentrate
• confederate
• consociate
• conspire
• converge
• couple
• federalize
• federate
• funnel
• gang
• intersect
• league
• marry
• meet
• middle
• nip
• organize
• pair
• partner
• pinch
• taper
• unionize
• unite
• wed