to treat (somebody or something) with contempt or, esp by deliberately ignoreing them or it
Five dressy girls, of thirty-one or more: so gracious to the shy young men they snubbed so much before — Lewis Carroll
to check (e.g. a rope) suddenly while running out, esp by winding it around a fixed object
to halt or restrict the motion of (e.g. a boat) by snubbing a line
[Middle English snubben to rebuke sharply, from Old Norse snubba to rebuke or check]