The Spanish word 'gripe', meaning 'flu' or 'influenza', comes from the French word 'grippe', which also means 'influenza'. The French term ultimately derives from the Frankish word 'grip', meaning 'claw' or 'hook'. This etymology reflects how the illness seems to 'grip' or 'seize' its victims, as the flu often takes hold of a person suddenly and forcefully, like being grabbed by claws.

The Spanish verb 'gripar' is directly related to 'gripe' and means 'to catch the flu'. The adjective 'gripal' is also commonly used to describe anything related to the flu, as in 'infección gripal' (flu infection).

While not directly related, the English word 'grip' shares the same Germanic root as Spanish 'gripe', though it retained the original meaning of 'to grasp or hold firmly'. The English word 'grippe' was historically used as an alternative name for influenza, borrowed from French, though it's now considered archaic. This connection helps remember that the flu 'grips' or 'seizes' its victims.