In a message dated 17/02/2009 13:32:40 GMT Standard Time, [email protected]  
writes:

I've always  called the really thin ice "cat ice" as well, although I 
don't know where  the phrase comes from either.




One definition of 'cat ice':
 
"Ice forming a thin shell from under which  the water has receded." 
(Navigation Dictionary USHO, Bulletin 220, 1956) The  term has some application 
to ice 
on lakes.
 
and another (at _http://www.xmission.com/~emailbox/phrases.htm_ 
(http://www.xmission.com/~emailbox/phrases.htm) ):
 
Cat ice - Thin, dangerous ice
Ice that would not  support a cat, similar to the phrase "skating on thin 
ice." 

 
(Thanks are due to search engines . . .  )
 
DaveD


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