The Spanish verb 'gravar' comes from the Latin verb 'gravare', meaning 'to burden' or 'weigh down'. The Latin 'gravare' itself was formed by combining the adjective 'gravis' (meaning 'heavy') with the verbal suffix '-are'. Over time, while maintaining its basic sense of 'burden', the Spanish word specialized to also mean 'to tax' or 'to impose a financial burden'.

Several common Spanish words share this Latin root 'gravis', including: 'grave' (serious, grave), 'gravedad' (gravity, seriousness), and 'agravar' (to aggravate, make worse). All these words carry the underlying notion of heaviness, whether physical or metaphorical.

English speakers can connect 'gravar' to several familiar English words that come from the same Latin root 'gravis', such as 'gravity', 'grave' (serious), 'gravitate', and 'aggravate'. The connection becomes clear when you think about how gravity makes things heavy, how grave matters weigh heavily on our minds, and how aggravating situations add to our burdens.