So disgusting or offensive that it causes strong disgust or disgust; extremely unpleasant to see, taste, or think about.
From the verb 'revolt,' which comes from French 'révolter' (to rebel), from Latin 'revolvere' (to turn back). The meaning evolved from 'rising up in rebellion' to 'causing one to turn away in disgust' because both involve a turning away or rejection.
The word 'revolt' originally meant a military rebellion, but because people physically turn away from disgusting things just like they turn away from authority they reject, the word took on its gross meaning. Language often borrows military or political words to describe our physical reactions!
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