1.VerbTo acquire or increase stock or inventory. .mw-parser-output .object-usage-tag{font-style:italic}.mw-parser-output .deprecated{color:var(--wikt-palette-grey-lime-8,olivedrab)}[ with on]
"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."
2.VerbTo swell up (usually refers to edema in a leg).