How to Say "they subsist" in Spanish
The Spanish word for “they subsist” is “viven” — B2 level.
English → SpanishB2
verbB2
survival

Examples
Viven de la pesca y el turismo local.
They make a living from fishing and local tourism.
Muchos artistas viven al día, sin ahorros.
Many artists live day to day (subsist), without savings.
Vivir DE
When referring to the source of income or sustenance, vivir always requires the preposition 'de' (of/from): 'Viven del arte' (They live from art).
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