The Spanish word 'zanja', meaning 'trench' or 'ditch', has an interesting journey through several languages. It begins with the Ancient Greek word 'kharassein', which meant 'to sharpen, incise, or engrave'. This word was borrowed into Latin as 'charaxare', meaning 'to cut or incise'. The word then made its way into French as 'jansier', meaning 'to split or make a cut'. Finally, it entered Spanish as the verb 'zanjar' meaning 'to dig a trench', from which we get the noun 'zanja'.

You can see how the meaning evolved from the general concept of cutting or incising in Greek and Latin, to splitting in French, and finally specializing to mean specifically a trench or ditch in Spanish. The sound changes also show a pattern, with the initial 'ch-' sound becoming 'j-' in French and then 'z-' in Spanish, which is a common pattern of sound changes between these languages.

The verb 'zanjar' is directly related to 'zanja' and is commonly used in Spanish. While 'zanja' is the noun meaning 'trench' or 'ditch', 'zanjar' is the verb meaning 'to dig a trench'. In modern Spanish, 'zanjar' has also taken on the figurative meaning of 'to resolve or settle (a problem or dispute)', perhaps from the idea of creating a clear path or division, just as a trench creates a clear line in the ground.

While English doesn't have any direct cognates from this Greek root that are obviously similar to 'zanja', we do have some more distant relatives through the Greek 'kharassein'. The English word 'character' comes from this same Greek root, as it originally referred to a distinctive mark that was engraved or inscribed. We also get 'chart' and 'card' from this root, both originally referring to things that were written or marked upon. The connection between these English words and 'zanja' is that they all derive from the concept of cutting or marking into something.