To be of use, to benefit, to be profitable, to be familiar with
Brown-Driver-Briggs Hebrew Lexicon
1) to be of use or service or profit or benefit 1a) (Qal) 1a1) to be of use or service 1a2) servitor, steward (participle) 1a3) to benefit, profit 1b) (Hiphil) to be used, be wont, exhibit use or habit, show harmony with, be familiar with, know intimately