The Spanish verb 'chingar' (meaning 'to fight, harm, or molest') comes from the Caló word 'čingarár' meaning 'to fight'. Caló is the language of the Romani people in Spain and Portugal. The Caló term itself is a compound derived from two Indic (ancient Indian) roots: 'činár' meaning 'to cut' and 'kerár' meaning 'to do/make'. The combination of these roots to mean 'to fight' is quite logical - essentially describing the act of 'making cuts' or 'doing cutting', which evolved into the more general concept of fighting or causing harm.

This word is considered quite vulgar in Spanish and doesn't have many common, neutral relatives in modern Spanish. However, it's important for learners to recognize it as it appears in many colloquial expressions and can be considered offensive in most contexts.

While there aren't direct English cognates from this Caló/Indic etymology, it's worth noting that English borrowed some words from Romani (the larger family of languages that includes Caló), though none that are related to this particular term. This serves as an interesting example of how Spanish vocabulary has been influenced by the Romani people's presence in the Iberian Peninsula.