stock up verb 3stock-up noun 1forms 4 verb3 •To acquire or increase stock or inventory.Q: What about fuel oil? A: We plan to stock up before November.Q: What about food? A: We're planning to stock up on canned goods before November. •To swell up (usually refers to edema in a leg). •To extirpate; to dig up. stock-up noun[before a noun]1 •The act or an instance of stocking up.Come to our stock-up sale and save big!Do you have a stock-up price? [for bulk discount] formsstocked up · stocking up · stocks up · stock-ups