בֹּסֶר (bōser) is
a Hebrew noun
meaning unripe. It appears
4 times
in 3 books of the Hebrew Bible
(Strong's H1155).
Also rendered
unripe grape
Same Hebrew root (TWOT 257a)
Range of meaning (TWOT 257a)unripe, sour grapes; an immature grape; unripe grape, sour grape
Full entry: Brown-Driver-Briggs and Strong's
בֹ֫סֶרnoun, masculine: unripe, sour grapes
Strong's H1154בֶּסֶר: an immature grape KJV:unripe grape.
Strong's H1155בֹּסֶר KJV:sour grape.
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.