The Spanish verb 'cubrir' (meaning 'to cover') comes from the Latin word 'cooperire', which meant 'to cover completely'. The Latin 'cooperire' itself was formed by combining two elements: the prefix 'co-' (meaning 'together' or 'completely') and the verb 'operire' (meaning 'to cover'). Over time, as Latin evolved into Spanish, 'cooperire' underwent phonetic changes to become the modern Spanish 'cubrir'.

Some related Spanish words include 'cubierta' (cover, deck), 'descubrir' (to discover, uncover), 'encubrir' (to conceal), and 'recubrir' (to cover again, coat). All these words share the same root and relate to the basic concept of covering or uncovering something.

English speakers might recognize the connection to words like 'cover' and 'discover', which share the same Latin ancestry. The English word 'cover' comes from Old French 'covrir', which also descended from Latin 'cooperire'. This explains why 'cubrir' and 'cover' sound somewhat similar and have the same meaning. The word 'covert' (hidden or secret) is another English relative that maintains this connection to the idea of covering.