The Collaborative International Dictionary of English v.0.48:
Breast-deep \Breast"-deep`\ (br[e^]st"d[=e]p`), a. Deep as from the breast to the feet; as high as the breast. [1913 Webster] Set him breast-deep in earth, and famish him. --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
breast-deep adv 1: up to the breast; "we were standing breast-high in the water" [syn: breast-deep, breast-high]