Isaiah 5:1 Now will I sing to my wellbeloved a song of my beloved touching his vineyard. My wellbeloved hath a vineyard in a very fruitful hill:

{a very...: Heb. the horn of the son of oil}


How does that work, to get 'very' translated 'the horn of the son of oil?

How tranferrable is this meaning to other 'very's, and how would I know the difference, please?