DCHP-1 Online
rat-hill Northwest 
n. a breathing-hole made in the ice by muskrats and kept open by means of tufts of grass and other vegetation stuffed in the opening.
See also: pushup
- 1937 She came . . . investigating a willow that Jones had stuck on a mound he had made in the snow where no rat-hill was.
- 1937 She came . . . investigating a willow that Jones had stuck on a mound he had made in the snow where no rat-hill was.