snub (v.) Look up snub at Dictionary.com
mid-14c., "to check, reprove, rebuke," from Old Norse snubba "to curse, chide, snub, scold, reprove." The ground sense is perhaps "to cut off," and the word probably is related to snip. Compare Swedish snobba "lop off, snuff (a candle)," Old Norse snubbotr "snubbed, nipped, with the tip cut off." Meaning "treat coldly" appeared early 18c. Related: Snubbed; snubbing.
snub (n.) Look up snub at Dictionary.com
"rebuke, intentional slight," 1530s, from snub (v.).
snub (adj.) Look up snub at Dictionary.com
"short and turned up," 1725, in snub-nosed, from snub (v.). The connecting notion is of being "cut short."