Search Result：up to their necks
up to their necks 
(TTS Sound)
(TTS Sound)Overview of adj up_to_their_necks
The adj up to their necks has 1 sense
- neck-deep, up to my neck, up to your neck, up to her neck, up to his neck, up to our necks, up to their necks -- (deeply involved; "neck-deep in work"; "up to their necks in debt")