That's not an idiom - it means exactly what it says - there are twelve months in a year.
1900th century
you found it
Possible alteration of "fadge". to fit.
The origin of the idiom, look before you leap is by John Heywood in 1546. The idea behind the phrase was updated in a song by The Miracles called Shop Around, in 1960.
The source seems to be Arabic. We may find the same idiom in Portuguese, Spanish, Italian and Turkish actually.
To be exposed
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Origin "up a storm"
No
means a year
It is a slang term from the 1930's, origin not known
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affrica (iraq
RELAX
It is just an idiom and has no history.
grab a bite
1900th century