A four letter word meaning not kosher is: tref
kill
aver
into
The word pine can have that meaning.
A four-letter word for cooking fat is "lard".
A four letter word meaning to grow light as the sun rises is dawn.
Sherry J. Martin has written: 'Using Alpha Four' -- subject(s): Alpha Four, Database management
stop or halt is a four letter word meaning the opposite of go.
A four letter word meaning the foundation of something is base.
spit
circa