snub (v.) Look up snub at Dictionary.com
mid-14c., "to check, reprove, rebuke," from Old Norse snubba "to curse, scold, reprove." Meaning "treat coldly" appeared early 18c. Related: Snubbed; snubbing.
snub (adj.) Look up snub at Dictionary.com
"short and turned up" (of the nose), 1724, from snub (v.). The connecting notion is of being "cut short."