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Difference between Feed off something and Feed on something

feed off something

1. use smth. as food:

  • Blacktip sharks are reef sharks; they feed off fish living in the coral, and are not interested in big mammals.

2. use smth. to advantage (usually with negative implication):

  • They feed off our desire to smoke and the miseries of our lives that caused most of us to start smoking.

feed on somethingeat certain food as one’s regular diet:

  • These sharks are bottom dwellers, in nature they feed on fish and shellfish that they suck out of the sand.