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

• speaker system
• speaker unit
• speakerphone
• speakership
• speaking
• speaking trumpet
• speaking tube
• spear
• spear carrier
• spear thistle
• spear thrower
• spear up
• spearer
• spearfish
• spearhead
• spearhead-shaped
• spearman
• spearmint
• spearmint oil
• spearnose bat
• spearpoint
• spearwort
• spec
• special
• special act