What is "blowing one's nose"

Usage examples of "blowing one's nose".

While in the South one dried one's hands by wiping them on one's tunic, here in the North thick towels were provided, then draped over one's knee afterward, where they could be used for wiping grease or for blowing one's nose.

But this, unfortunately, had been followed by four classes to introduce them to a lot of tedious, incredibly complicated ceremonies for meals, for special Minbari holidays, for greeting the day, for going to bed at night, for giving gifts, for just about everything, it seemed, short of blowing one's nose and going to the bathroom.