DCHP-1 Online
false ice 
a surface layer of thin ice formed over the thick under-surface and separated from it by a layer of water, slush, or air of varying depth.
- 1858 (1863) We had a good deal of trouble getting past several great rapids, where there was much false ice, through which our dogs broke several times.
- 1858 (1863) We had a good deal of trouble getting past several great rapids, where there was much false ice, through which our dogs broke several times.