The Definition of a Quarrel
The lovely thing about the internet is that it is capable of being edited by pretty much anyone, any time, for any reason. Now, this ability can be used for evil (trolls, haters, propagandists, politicians), but it can also be used for good.
For instance, the word 'quarrel' does indeed refer to a crossbow bolt with a pyramidal-shaped head, but I did not find it on Wiktionary. So you know what? I added it! It's a completely valid definition and deserves to be there.
But you know what else I did? I added another definition for the word 'quarrel'. See if you can guess which one :-D Here's the link!