Definitions from Wiktionary ( )

▸ verb:  (ambitransitive) To make a short, audible inhalation, through the nose, as when smelling something.
▸ verb:  (transitive) To say (something) while sniffing, such as in case of illness or unhappiness, or in contempt.
▸ verb:  (transitive) To perceive vaguely.
▸ verb:  (intransitive) To pry; to investigate in an interfering manner.
▸ verb:  To be dismissive or contemptuous of something; used with at.
▸ verb:  (computing) To intercept and analyse packets of data being transmitted over a network.
▸ verb:  (slang, chiefly UK) To inhale drugs (usually cocaine) through the nose, usually in powder form.
▸ noun:  (countable) An instance of sniffing.
▸ noun:  (countable) A quantity of something that is inhaled through the nose.
▸ noun:  (countable, colloquial) A brief perception, or tiny amount.
▸ noun:  (uncountable, slang) Cocaine.
▸ noun:  (countable, slang) A toddler or young child.

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