buy in(v = verb.possession) stock, stock up - amass so as to keep for future use or sale or for a particular occasion or use; "let's stock coffee as long as prices are low"
is one way to furnish, provide, render, supply
Sample sentences: Somebody ----s something

VB  buy, purchase, invest in, procure, rent, repurchase, buy in, keep in one's pay, bribe, suborn, pay, spend, make a purchase, complete a purchase, buy over the counter, shop, market, go shopping.

buy, buy at, buy back, buy food, buy into, buy it, buy off, buy out, buy the farm, buy time, buy up, not buy