to be, to become: a rare Hebrew verb for coming to be something, standing where the ordinary verb for being would normally go
Hebrew has two verbs for being, and this is the rare one. The common verb (הָיָה) turns up thousands of times; this one carries this meaning in only five verses, scattered across a father's blessing, a poem about refugees, a hostile letter, and two lines of Ecclesiastes. Where it does appear it is doing the ordinary work of the common verb, so an English translation shows nothing unusual.
What holds its handful of uses together is a pull toward coming to be rather than simply existing. Three of the five ask someone to step into a position they do not yet hold: a son told to be master of his brothers, a people told to be a hiding place for the hunted, a governor accused of setting himself up as king. The other two ask what has ended up being the case: what a person actually gets out of a lifetime of work, and where a fallen tree stays.
Its distribution is the interesting part. It shows up in poetry and in the later books, and it matches the everyday Aramaic verb for being, consonant for consonant, which is why most of these verses are read as Hebrew reaching for an Aramaic flavored form rather than as a special Hebrew word with its own force.