I'm re-reading "Treasure Island". The when the mysterious ex-pirate who was a guest at the Admiral Benbow Inn, died after recieving the "black spot", Jim Hawkins' mother in searching the pirate's chest to get the money he owed her,
found a "gully".
I never heard of a knife by that name, but it is in my dictionary, the second definition:
gully 1
n.,
pl. 3lies 5altered < ME golet, water channel, orig., GULLET6 a channel or hollow worn by running water; small, narrow ravine
vt.
3lied, 3ly[ing to make a gully or gullies in

gully 2
n.,
pl. 3lies 5< ?6 [Brit.] a large knife

This is a creepy word for a knife, really. Especially if you consider a murderer gullying a victim with a gully (knife).

And even curiouser--as English is--that a gull is such a lovely bird and hasn't much at all to do with either knife or a gully unless one factors in water. I don't suppose there is a linguistic connection between the seagull and the ravine gully, is there?

and to gull someone is to fool them or con them out of something. The birds aren't that tricky they just grab and go.

And if they are liable to be gulled then they are gullible.