Subsist (verb)

1. To maintain or support oneself, especially at a minimal level; to survive.
2. To exist or continue in a certain state or condition.

Origin:

From latin "subsistere" meaning to stand under or be present beneath something, to exist or survive.

Examples:

1. The family subsisted on a small income.
2. The refugees subsisted on meager rations.
3. The community subsisted on hunting and gathering.
4. The plant subsisted in harsh conditions.
5. The company subsisted on its reputation for quality products.