It's bad enough being called Prue, but as for prusik...
...I don't know, though. Dr Prusik saw his name used as both a noun and a verb, so he must have had some affection for the horrible thing. Either that, or he really wanted to be famous.
A prusik is a sort of knot that locks under pressure.
It's most often used, as above, to make a loop in a cord that you attach to a rope, though the term prusik is used in mountaineering circles for more or less anything that can grab a rope.
To prusik is to climb a rope using prusik loops.
Prusik knots apparently have all sorts of advantages over other types of rope-grabbers, and they are also useful, it is said, for extemporising a pair of handcuffs. They are a hazard on ropes with a very low melting point, though, and they don't work at all on frozen wet ropes.
I would suggest, when it's wet and freezing (and, actually, even when it isn't) visiting a nice tea shop, instead.
Word Not To Use Today: prusik. The prusik hitch is named after the man who may have invented the knot, Dr Karl Prusik. The first mention of the word was in 1931.