SUCCINCT SUMMARY
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One  of Rashis 5 main goals is to give the meaning of words
the same way the dictionary gives meaning. We call this the
Rashi RULE of WORD MEANINGS.

Rashi had a variety of vehicles to present meaning. A common
technique of explaining meaning is the skillful use of
IDIOMATIC USAGE--that is collections of words
which mean more than the individual words.We call this the
RASHI SUBRULE CLASS of NEW MEANINGS. It could also more
appropriately be called the rule of IDIOMS.

EXAMPLE Lv05-01a
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The Biblical text at Lv05-01a states
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If a person sins
he hears THE VOICE OF A CURSE / OATH
- and he is a witness
- either he saw or knew
- if he doesnt tell [testify]
- he must bear his sin
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Rashi comments:
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The VOICE OF A CURSE is an idiom that refers
to a subpoena before a court to bring evidence
in a case and when they deny knowing anything
they are sworn that they no nothing [hence the
idiom the VOICE OF THE CURSE/OATH that they know
nothing]
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LIST854y gives other examples of 2-3 word Biblical idioms

A List of Biblical idioms..eg FROM DAYS DAYS=YEARLY
LIST854y continues  LIST854d LIST854y