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sustenance (noun) means of livelihood.
Sustenance is the food and drink that human beings, plants and animals need to be alive. Grass is the sustenance of the herbivorous animals. That is, grass-eating animals eat grass to be able to be alive. Sustenance also means the means to continue something.
- During his illness bread and milk were his only means of sustenance. He lived on them during the whole period.
- Trust among partners is essential for the sustenance of prosperous business.