1. Deeply involved
   "up to their necks in debt"
   - neck-deep, up to my neck, up to your neck, up to her neck, up to his neck, up to our necks

See also: involved

• cabin class
• cabin cruiser
• cabin fever
• cabin liner
• cabinet
• cabinet minister
• cabinet wood
• cabinetmaker
• cabinetmaking
• cabinetry
• cabinetwork
• cable
• cable car
• cable length
• cable railway
• cable system
• cable television
• cable television service
• cable tramway
• cable's length
• cablegram
• cableway
• cabman
• cabochon
• Cabomba