c. So as to be utterly committed; up to the teeth: heavily involved or absorbed.
ΚΠ
1934 T. E. LawrenceLet. 8 June (1938) 805 At the moment we are all up to the teeth in 5 more target boats.
1974 Spartanburg (S. Carolina) Herald 25 Apr. a11/6 A young farmer who is starting out and he's mortgaged to the teeth at the bank would not look at it the same way.