Hay knife - definition of Hay knife by The Free Dictionary
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A toothed knife about three feet long used to cut hay from a haystack. After hay had settled in a stack, it was very hard to pull out chunks with a pitchfork. It was usually much easier and convenient to first cut off a section of hay with a hay knife.
References in periodicals archive
FOLKS WHO MAKE HAY on a small scale often simply stack the dried forage--usually out of the elements--but piles of loose hay take up a lot of space and are sometimes difficult to feed from without the help of a hay knife
and some serious labor.
One example was Jim Gray's new old stock (NOS) hay knife
with the Ney name intact.